Calendar of intrauterine development of a child by week. Pregnancy by week - fetal development and woman’s sensations

During this period, an organism with primitive anlages emerges from a fertilized egg. various systems and organs. Intrauterine development is divided into prefetal and fetal stages. The boundary between them is the end of the second month of the embryo’s life, when it turns into a fetus.

The beginning of time

Fetal development begins not from the embryonic period, but even earlier, because the embryo develops from a fertilized egg, and fertilization of the egg is preceded by the long development of germ cells.

The pre-embryonic period includes the maturation of germ cells and fertilization.

If in the testes of men constant renewal of germ cells occurs on average every 2 months, then in the ovaries of women there is no renewal. After the birth of a girl, there are only about 400 thousand cells in her ovaries - the precursors of eggs, which are given to her for life. In each menstrual cycle, one, or less often two, eggs are released from the ovary. This process is called ovulation. After leaving the ovary, the egg enters the fallopian tube, where fertilization occurs - the fusion of the female and male reproductive cells.

This fusion leads to the formation of a qualitatively new cell - a zygote. Zygote by fallopian tube moves into the uterine cavity (this period lasts 7-8 days). When the zygote reaches the uterus, implantation begins - the implantation of the zygote into the wall of the uterus. The implantation process lasts 3 days.

In the prefetal period, intensive anatomical formation of the rudiments of organs that arose during the formation of the embryo occurs, and new anlages arise: the stomach and other parts of the digestive tract are distinguished, the intestinal anlage is divided into sections, the muscles are separated, and the skeleton is formed. In the second half of the prefetal period, the facial parts and neck are formed, the circulatory system and sensory organs develop, the structure of the brain becomes more complex, and large digestive glands are secreted - the liver and pancreas. By the end of the second month, the rudiments of all organs are formed and occupy their permanent position.

During the fetal period, growth and functional maturation of fetal organs and tissues occur, i.e. starting from this period, the fetal organs acquire the ability to function.

Second month. In the embryo (its length is 4 - 5 mm), the anlage of the limbs becomes noticeable. By the end of the second month, the length of the embryo increases from 5 mm (at the 5th week) to 25 - 30 mm. The hands and feet have fingers that are already capable of movement; but these movements are not yet felt by the mother. Enough a long tail gradually turns into a small tubercle. The neck is being formed. The brain stops showing through the skin. The rudiments of the sensory organs are formed from the protrusions and depressions of the brain, while the eyes are already almost completely formed. The size of the head is very large (it is about half the length of the entire embryo). Installed permanent relationship the main structures of the face, with the exception of the ears, which are located very low. The fetal body begins to function: the brain sends impulses that coordinate the functions of other organs, the heart beats, the stomach secretes gastric juice, the liver produces blood cells. The rapid growth of the intestine, which began in the 6-7th week, leads to the fact that some of the intestinal loops no longer fit into a small abdominal cavity embryo and goes beyond its limits. A so-called physiological umbilical hernia occurs, which reaches full development by the end of the second month, and completely disappears by the 10th week. At the end of the second month (8 weeks), the fetal body is formed, the rudiments of the limbs are present, the rudiments of the eyes, nose, and mouth are visible on the head, and the formation of the genital organs begins.

Third month. The total length of the fetus, including legs, is 7 cm, weight - 20 g. During the third month, the fetus grows rapidly and almost doubles its length. The head still remains relatively large and by the end of the month is about l/3 of the parietal-coccygeal length. The facial part is very small compared to the brain part of the skull. There is rapid growth of the eyelids, the edges of which fuse together in the 9th-10th week of embryonic development. The eyes open only in the seventh month of pregnancy. The first rudiments of hair appear (on the eyebrows, upper and lower lips, on the forehead). The limbs move, fingers and toes are visible, and the first points of ossification appear in the cartilaginous rudiment of the skeleton. Nail rudiments form on the fingers and toes. The fetus already knows how to grimace. Special studies have found that fetal facial expressions reflect changes in his mother's face when laughing or crying. The hands grow so much that the fetus can touch its head with its fingers and can clench its fists. At the beginning of the third month, the urogenital and anal openings appear. Based on the structure of the external genitalia, the sex of the fetus can be determined. By the end of the third month, the skin begins to lose the transparency characteristic of it in the first two months of intrauterine life.

Fourth month. The total length of the fetus, including legs, is 15-18 cm, weight - 120 g. The head begins to lag somewhat behind in growth. Vellus hair appears on the body. The arms and legs are approximately the same length. The face is formed, the skull ossifies, the formation of the muscular system basically ends, the movements of the limbs become more active, but are not yet perceived by the mother, the sex of the fetus is clearly distinguished. The fetus moves a lot and can suck its own finger. The skin has several layers. The functions of various body systems become more complex. Using electron microscopy, it was found that the structure nerve cells the brain of a fetus of this age is almost the same as that of newborns. It is already well possible to listen through the abdominal wall of a pregnant woman to the fetal heartbeat, the frequency of which reaches 120-150 beats per minute. By the end fourth month The enlargement of the pregnant woman’s abdomen is already becoming noticeable.

Fifth month.(The total length of the fetus, including legs, is 22 cm, weight - 300 g). The body grows more rapidly, and by the end of the fifth month intrauterine development the head is no more than l/3 of the total body length. The skin is dark red in color. A subcutaneous fat layer begins to form. The skin is covered with vellus hair. Sebaceous glands begin to secrete a fatty substance, which mixes with the scales of the epidermis and forms a cheese-like lubricant. This lubricant protects the fetus from constant exposure to amniotic fluid, and then facilitates its passage through the birth canal. Meconium forms in the intestines. The lower limbs are noticeably lengthened. The fetus can be born alive and makes breathing movements, but at this stage of pregnancy it is usually not viable.

He is no longer so free in the amniotic sac, and his motor activity increases. In the 3rd week of the fifth month, a woman who is pregnant for the first time begins to feel these movements. Repeatedly pregnant women notice them 10 days earlier. At first, the movements are very weak - women may confuse them with intestinal contractions. Later, the movements of the fetus become more and more intense, and they can no longer be confused with anything. The mother's first registration of fetal movements is an important sign that allows one to calculate the date of the upcoming birth.

Sixth month. The total length of the fetus, including legs, is 30 cm, weight - 800 g. The skin of the fetus becomes wrinkled, apparently due to a discrepancy between the growth rate of the fetus itself and its skin. Eyebrows and eyelashes become noticeable. Skin patterns form on the fingertips. Each of them has their own design - unique and inimitable. During this period, the formation of cells in the cerebral cortex is largely completed. Their loss under the influence of any damaging factors is not compensated. A person lives all his life with the number of cells that have formed the cerebral cortex by that time. Fetal movements become more differentiated. By observing the fetus using ultrasound, German scientists have learned to determine by the position of the hands whether the fetus is in a state of wakefulness or sleep. The organs and systems of the fetus continue to develop, master new functions, but are not yet perfect enough and are not able to support the life of the fetus outside the womb.

Seventh and eighth months. The total length of the fetus, including legs, is 35-40 cm, weight - 1200-1700 g. The subcutaneous fat layer increases, and the skin becomes denser and smoother. In the seventh month of pregnancy, the fetus's eyelids open. He can open and close his eyes. By this time, his entire body is covered with delicate vellus hairs. In recent weeks, weight gain is mainly due to subcutaneous fat, which ensures the maintenance of a stable body temperature after childbirth. All the most important systems of the body are sufficiently developed and can, although with great difficulty, with special care, support the life of the baby outside the mother’s body.

At about seven and a half months, the fetus can be born and survive. Babies born during the third trimester (from the seventh month until the end of pregnancy) are usually able to survive, although as the due date approaches, both the chance of survival and the ease of transition to independent existence increase significantly. Towards the end of pregnancy, antibodies from the mother cross the placenta to the fetus, creating short-term resistance to diseases to which you are immune. Premature babies receive less of this protection than full-term babies, therefore they are more susceptible to infections.

Ninth month. The total length of the fetus, including legs, is 45 cm. Due to the strong deposition of fat in the subcutaneous fatty tissue, the shape of its body becomes more rounded. The fingernails reach to the fingertips. The hair on the head becomes thicker and longer. The fetus born at this time is viable, screams loudly, opens its eyes, and the sucking reflex is expressed.

In the eighth - tenth months the growth rate of the fetus decreases. He is already so big that he feels cramped in the amniotic sac. In this situation, the most advantageous position, providing maximum mobility in the funnel-shaped uterus, is the head down position. Fine developing fetus accepts it. Head presentation most favorable during obstetrics. By the end of the ninth month, the fetal body is so perfect that it is finally ready for extrauterine life. Delicate hairs remain only on the forearms. Their severity and distribution throughout the body may indirectly indicate insufficient fetal maturity.

Tenth month. The total length of the fetus, including legs, is 50 cm, weight - 3000 g. By the end of the tenth month of pregnancy (38-40 weeks), signs of prematurity disappear, and the fetus is born mature. A discrepancy between term and fetal maturity is relatively rarely observed. Under unfavorable developmental conditions (maternal illness, insufficient or unhealthy nutrition, etc.), a full-term baby may have signs of immaturity. Sometimes the opposite phenomenon is observed: the child is born a little premature, but mature.

In the last month, the lower extremities grow more rapidly, and the difference in length compared to the upper extremities is smoothed out. However, it is only after birth that the legs become longer than the arms.

Let us remind you that the correct intrauterine development of a baby largely depends on its mother. During the examination, follow all the recommendations and the doctor’s appointment - and the child will be born healthy.

Forming a new life is a real mystery. This period is happy and at the same time exciting, because a woman will have to face something new. From the moment of conception to the birth of the baby, a whole stage passes, which entails many changes in the body of the expectant mother. To understand what is happening, consider each week of fetal development during pregnancy and the woman’s feelings at this stage.

IN medical practice It is customary to use the obstetric (calendar) and embryonic weekly period of pregnancy development. This is a simple mathematical calculation. Obstetric term is calculated from the beginning last menstrual period taking into account the cycle. Fertilization does not always occur at this stage. It can happen in 14-18 days. It depends on the time of ovulation in a woman. You can find out about pregnancy by measuring your basal temperature. Tests and analysis of hCG will not show the onset of conception, since in the woman’s body at this time only preparations for a future pregnancy occur.

The pregnancy diary is kept week by week from the conception process. The fusion of sperm and egg occurs in the fallopian tube. After the male and female cells unite, a zygote is formed. It is the basis for the development of the baby, all his organs and systems. At the same time, the first changes begin in the woman’s body. From the 5th-6th day of fertilization, hormonal levels change. The woman begins to produce hCG. The expectant mother's immunity decreases, which is a normal reaction of the body to protect the fetus from rejection.

In the first week, the woman does not feel any serious changes. Therefore, it is difficult to accurately calculate the date of conception. It is extremely rare that an expectant mother may feel signs of toxicosis, a change in taste and smell. Some mothers experience swelling in their breasts, increased nipple sensitivity, and pulling sensations lower abdomen. A woman usually leads an active lifestyle, sleepiness and change emotional background not available yet.

• give up bad habits;
• switch to proper nutrition, give up junk food;
• any medications or medical procedures take place only as prescribed by a doctor, informing him of the possible occurrence of conception;
• take vitamins, eat a lot of vegetables and fruits;
• maintain sufficient physical activity;
• visit often fresh air.

A pregnant woman should try not to be nervous; stress has a negative impact on the unborn child. You can read more about the first week.

Starting from the second week, you can already carry out tests and donate blood for hCG. At this stage, in most cases, pregnancy can be confirmed.

2 week

If we take obstetric dates, then the second week of pregnancy is the period of conception. It is at this time that a woman ovulates. The ovary releases a female cell that travels into the fallopian tube. There she waits for fertilization for 24 hours. Male cells– sperm live longer. They remain active for up to five days. When they meet, conception occurs. If fertilization does not occur, after 2 weeks the unfertilized egg is excreted from the body with menstruation.

From the second week of pregnancy, many girls feel some changes in their bodies. Pregnancy occurs with the following sensations:

• the appearance of sensitivity to various odors. Habitual aromas can become so intense that it greatly irritates the expectant mother;
• mood changes. Emotional “swings” are explained by changes in hormonal levels;
• There may be a pulling, even quite painful feeling in the lower abdomen and back area. This happens due to contraction of the reproductive organ, because the uterus tries to get rid of the endometrium;
• Some women develop increased sexuality during pregnancy. This is due to changes in hormonal levels.

The description of these symptoms does not apply to all women. Sometimes mothers do not feel any changes, especially if it is their first pregnancy. Read more about the second week.

You can find out about the onset of ovulation by measuring basal temperature, using special pharmacy tests or through a simple calculation if the menstrual cycle is regular.

3 week

It is the third week of pregnancy according to the obstetric period that is considered the time of birth of a small organism. At this stage, a complex process occurs that gives rise to a new life. After the strongest and most active sperm reach the female cell, one of them penetrates the egg. Here a fusion occurs, accompanied by the formation of a set of chromosomes of the unborn child. Surprisingly, the sex of the baby is already determined at this stage. Sperm that do not reach the egg die.

A fertilized female cell is called a zygote. Immediately after fusion, it moves down the fallopian tube into the uterus. During this period, the fertilized egg feeds on various protein compounds. After attachment in the uterus, the long and complex path of fetal development begins. Often at this time a woman may notice slight spotting, but often this symptom goes unnoticed.

Photos of the fetal ultrasound can be found below.

After fertilization, the egg begins to actively divide into blastomeres. At the next stage, the morula is formed. Around the fifth day, a hollow ball is formed, which is called a blastocyst. After it reaches a significant size and the wall ruptures due to stretching, the process of hatching of the embryo from the shell occurs. Immediately after this, the blastocyst attaches to the uterine wall. As a rule, implantation occurs on the seventh day after fertilization.

In the third week, the woman feels some changes. These include:

• drowsiness, weakness, dizziness;
• changes in emotional background, frequent mood swings;
• many mothers experience nausea, changes in taste preferences;
• the breasts become fuller, the shade of the nipples may change (they become darker).

Most young mothers already know about their pregnancy or are beginning to guess about it. During this period, it is very important to take care of your health, because immunity is reduced, a woman is more susceptible to various diseases. For normal development of the embryo, doctors advise getting more rest and eating right. In this case it is necessary to use sufficient quantity vitamins and minerals. It will be useful to take folic acid and other vitamins, for example, Vitrum for pregnant women, Elevit pronatal and others. You can learn more about the development of pregnancy at 3 weeks.

4 week

In the fourth week, the active process of placenta formation begins. In addition, amniotic fluid appears. They are necessary for the normal functioning of the unborn child. During this period, the head and three main layers appear. In the future, all organs and tissues will be formed from these leaves.

At this stage, the embryo consists of the following parts:

• ectoderm (tissue from which the brain is formed);
• endoderm (from which the organs of the digestive system, liver, thyroid and pancreas);
• mesoderm (this is the rudiment of the skeleton and circulatory system).

So far, the embryo is very similar to a tadpole and does not have human outlines. Every day the future baby is actively growing and developing.

Mommy's condition remains unstable in the fourth week. A woman often feels mood changes. Drowsiness can be replaced by agitation of consciousness and vice versa. Tastes and smells continue to irritate. For some pregnant women, even ordinary cooking becomes unbearable. Many women suffer from morning sickness and malaise.

The tummy remains the same for now, but due to increased appetite, some girls may gain weight. The breasts increase slightly in size. Sometimes the sensitivity and appearance of the nipples increase.

Toxicosis is not observed in all women. Many lucky women are lucky enough to avoid these sensations altogether.

In the fourth week, pregnancy can be easily determined. HCG is already produced in large quantities, so the test will show two lines in 99% of cases.

If a happy event has happened, you should not delay a visit to the gynecologist. At this stage, it will be necessary to pass all tests and undergo an examination in a gynecological chair. This will help to timely identify certain diseases and carry out their treatment. In addition, we must not forget that sometimes it happens. This dangerous condition should be diagnosed and treated as early as possible. Read more about the fourth week.

5 week

In the fifth week, many women who have no idea about pregnancy begin to suspect their delicate situation. There is no menstruation, which most often acts as a signal of conception. In addition to frequent mood swings, there are other changes.

Physiological signs:

• dizziness and fainting. These conditions are explained by a sharp change in blood glucose levels. To avoid such phenomena, a pregnant woman should reconsider her diet, eat in small portions 4-5 times a day;
• increased vaginal discharge. Many mothers notice that the amount of mucus becomes large. This is explained by the process of formation of a plug, which will subsequently protect the fetus from various infections;
• pulling sensations and pain in the lower abdomen may indicate both natural contraction of the uterus and the threat of miscarriage. If you experience such sensations, you should consult your doctor.

In terms of her psycho-emotional state, a woman may experience fear, panic, and excitement. This is quite normal, because now mommy is responsible for her life and for the life of the baby.

In the fifth week of development, the embryo reaches a size of up to 2 cm. Moreover, its body is disproportionate. The head is large, and the body, in comparison, is small. This stage of development is very important. It is now that the neural tube is formed, which will later form the spinal cord.

In the fifth week, it is very important to continue to eat right, get plenty of rest, and avoid stressful situations. A woman should take vitamins and folic acid. Microelements are necessary for the proper formation of the fetal nervous system. If pregnancy occurs in winter time, you need to try to be in crowded places as little as possible. The transfer of viral and bacterial diseases during this period can lead to severe consequences, up to miscarriage. You can learn more about the fifth week from.

week 6

At this stage, the ultrasound can already see the fetal head, tubercles of the arms and legs. Very soon the fingers will begin to form. Already now the baby’s cheeks, chin, and mouth are emerging. During the sixth week of development, a change in appetite occurs. A woman may feel constant hunger, or, conversely, she may feel sick from any food. This is also associated with weight gain during pregnancy. Some mothers lose weight because severe toxicosis, others are getting better. In addition, in some girls the area in the lower abdomen increases slightly. More often this occurs with repeated pregnancies or with decreased uterine tone.

In the picture you can see the embryo at 6 weeks of pregnancy.

A girl should take care of her health and the health of the baby. Except proper nutrition, proper rest and hygiene, she should try to avoid contact with various chemicals. This even applies to ordinary household chemicals. A woman is recommended to often walk outside and listen to calm music. All information about the sixth week.

If you notice discharge with a foreign odor or color, you should tell your doctor about it. Such signs may indicate the presence of a fungal infection.

week 7

This period of pregnancy is accompanied by an important event. Corpus luteum replaced by the placenta. By this time, it should be fully formed and perform well in protecting the fetus. If a woman has suffered from various infectious diseases, the functions of the placenta may be impaired.

The baby is developing quickly. The weight is already 2 grams, and the size is about 2 centimeters. The fetus actively continues to develop its nervous system. The placenta provides the fetus with oxygen and essential nutrients. In addition, it protects against pathogenic microorganisms.

Physiological changes in the child:

• fingers and toes appear;
• bone tissue is formed;
• the embryo is already bending its knees and elbows;
• the heart has 4 chambers, thanks to which blood moves throughout the baby’s body;
• the rudiments of teeth are formed;
• nose and lips appear;
• The genitals are forming, but it is not yet possible to determine the sex of the child.

A young mother, in addition to toxicosis, at this stage may experience swelling, frequent urination, and indigestion. Due to the rapid development of the fetus, a woman often feels a pressing sensation in the lower abdomen. At the seventh week, the uterus reaches the size of a large apple. A dark line begins to appear from the navel to the pubis, and the nipples also darken. Detailed description.

8 week

If we consider pregnancy by month, then 8 weeks is 2 months. At this stage, the woman already clearly understands her condition. External signs of an interesting situation become noticeable:

• the figure is rounded, the gait becomes smoother;
• the condition of the skin changes. It is worth noting that for some ladies it becomes cleaner and smoother. Other girls have to deal with the appearance of acne and age spots;
• the desire to eat something incompatible becomes more and more pronounced.

The first trimester of pregnancy becomes a real test for many mothers. No need to worry. More often, toxicosis disappears by the end of the third month.

The baby's weight is already up to 3 grams. At this stage, almost all systems have already been laid down and continue to be actively formed. The tail, which was present in the coccyx area, disappears, the embryo moves its arms and legs. While these movements are unconscious and chaotic. Every day the bones become stronger. Read more about week 8.

Photo of the fetus on ultrasound

At the eighth week, the fetal visual system is effectively formed. The eyes are located closer to each other, the embryo takes on a human appearance. During an ultrasound examination, you can see the ear canal, facial features are barely noticeable. Surprisingly, during this period the child already reacts to touch.

Week 9

At this stage, the baby continues to grow, moving from embryo to fetus. The head is still large in size, the limbs are well formed. The baby moves freely in the amniotic fluid. Its size does not exceed three centimeters. The genitals are forming, but in the ninth week it is still impossible to determine the sex of the baby.

A woman should also be attentive to her health. If any uncharacteristic discharge appears, you should immediately contact a gynecologist. You also need to pay attention to painful or cramping sensations in the lower abdomen. This often requires consultation with a geneticist and other specialists. Your doctor may order a chorionic villus sampling test to determine possible birth defects. All about the ninth week.

10 week

The woman endures this stage more calmly. Mommy is gradually getting used to her new position, her fears and anxiety are calming down. The baby has already formed the main internal organs and systems, and the brain is actively developing. The baby weighs about 7 grams. The head gradually rises from the chest, becoming more proportional to the body.

In the fetal brain, new chains of neurons are formed every moment. The fingers and toes lengthen, but there is still a partition between them. The internal organs are in their places and continue to improve every day. In boys, testosterone is already beginning to be synthesized, and in girls, the hormone estrogen.

The young mother's mammary glands noticeably enlarge, and veins and capillaries become visible on them. The lower abdomen is rounded. During this period, it is necessary to review your wardrobe and put away tight items. Clothing should not restrict the stomach and chest. Due to the rapid growth of the uterus, the girl feels pressure on her internal organs, and urination becomes noticeably more frequent. I have to get up to go to the toilet even at night.

Don't worry about your changing body shape. A woman should enjoy her position and have a positive attitude. Read more about week 10 in this one.

11 week

At this stage of development, the baby already weighs approximately 11 grams, and its size is up to 6 cm. Using ultrasound, it is possible to determine whether the fetus is developing normally. The heart rate is about 140 beats per minute. The third month of pregnancy is accompanied by the formation of the ears and hair follicles. The baby requires more and more nutrients, because its growth is now very rapid.

Most mothers suffering from toxicosis feel relief. By this age, morning sickness and malaise gradually disappear. By the end of the third month, girls literally “bloom.” Feeling better.

If there is no threat of miscarriage, you are allowed to walk a lot and do gymnastics for pregnant women. To prevent the appearance of stretch marks on the body, you can use special creams or natural oils. Olive, almond, apricot and Peach oil. Find out about this deadline.

Nutrition should be complete. The diet should include porridge, soups, lean meat and fish, vegetables, and fruits. It is important to completely avoid caffeinated drinks and alcohol. It is also not recommended to use a large number of salty food. This can lead to swelling. The list of restrictions includes sweet baked goods and baked goods. large quantities, sparkling water.

12 week

It is believed that the risk of miscarriage is highest in the first trimester. At the twelfth week, the expectant mother feels more relaxed, anxiety and fears go away. Often pregnant girls hear that pregnancy suits them. Many ladies really blossom during this period. The hair becomes shiny and thick, the skin is firm, elastic, and more even.

Due to the fact that toxicosis by this time ceases to torment the pregnant woman, many forget about the need for a healthy diet. This is wrong, because healthy food and adherence to a daily routine are the key to the development of a healthy baby.

How much does the fruit weigh? At week 12, the fetus already weighs up to 14 grams. Its height is about 5-6 cm. Further development of the respiratory system occurs here, and the functioning of the digestive system is improved. The baby is already raising his head and taking a finger into his mouth.

In addition, the small organism already responds well to sounds and bright light. Read more.

Week 13

The thirteenth week is the beginning of the second trimester. During this period, doctors recommend that a woman maintain proper nutrition, get plenty of rest, and often be in the fresh air. The tummy becomes more rounded, the waist increases in volume. If a woman is carrying twins or triplets, the belly is quite large. Often multiple pregnancy happens during IVF (artificial insemination). On at this stage Mommy should already think about changing her bra. The breasts are quite large, so the usual underwear can squeeze them.

Going to the toilet at the thirteenth week becomes less frequent. This is explained by the raising of the uterus. When found painful sensations you should immediately contact a gynecologist. We must not forget that the threat of miscarriage remains at any time. Vaginal discharge should normally remain without an unpleasant odor or pathological color.

The baby is actively developing inside the mother's womb, its weight is about 20 grams, and its height is up to 7 cm. small organism reacts to music, touch, bright light, voices. At this stage, the following physiological changes occur:

• the eyes move more and more towards the bridge of the nose;
• muscles develop, bones become stronger;
• the auricle acquires normal shape;
• the baby has already been sleeping for several minutes;
• the child moves his arms and legs chaotically, but his knees still do not bend.

The size of the fetus is still so small that the woman does not feel its movements. The sex of the child cannot yet be determined. Read about this deadline.

Week 14

Week 19

• weight at 25 weeks is about 700 grams, height is approximately 35 cm;
• strengthening the skeletal system;
• improvement of muscle tissue;
• the baby constantly moves its limbs and turns its head;
• the grasping reflex develops;
• The leading hand is determined - right or left.

Due to the fact that the child’s inner ear is already formed, he orients himself well in space and takes a comfortable body position.

Week 26

With every day of pregnancy, the belly becomes larger, the load on the legs and spine increases. During this period, you should already think about maternity leave. Gait expectant mother more and more like a pendulum. The total weight gain ranges from 8-9 kilograms. If increased uterine tone has been diagnosed, the pregnant woman may be placed on preservation.

The baby's height is approximately 35 cm, and his weight is up to one kilogram. Due to the accumulation of subcutaneous fat, the baby becomes lighter and the skin becomes smoother. The little organism is improving every day. The pushes of the arms and legs become more noticeable and even painful for the mother.

During this time, you need to continue to eat right, watch beautiful films, listen to calm classical music. This will help improve emotional condition mother and baby.

Week 27

It becomes more and more difficult for a woman to do her usual tasks. Difficulties may arise at this stage of pregnancy when putting on shoes, tying shoelaces, and undressing. Many mothers go on maternity leave at this time. This time can be devoted to your favorite activities, hobbies, walks, watching films about the development and upbringing of children.

In the seventh month, changes in the fetus are as follows:

• the formation of such important processes as memory and thinking takes place;
• at this stage the little man’s temperament is formed;
• Bone tissue continues to strengthen, so a woman should not reduce the amount of calcium she consumes;
• further growth of adipose tissue occurs.

In the formation of primary immunity occurs. In the future, it will protect the baby from various diseases.

Many mothers gain quite a lot of weight at this stage of pregnancy. This makes them clumsy and clumsy. In addition, excess body weight provokes drowsiness and fatigue. It is very important to watch your diet, eat a lot of vegetables, herbs, fruits and cereals.

Discomfort in the lumbar region becomes a frequent companion for a young mother. To alleviate them, doctors recommend exercising special gymnastics, wear a bandage.

The following happens during development:

• the baby's layer of subcutaneous fat continues to thicken;
• the rudiments of intelligence appear in the brain, convolutions are formed;
• In response to any irritants, the baby frowns, grimaces, moves his arms, legs, and turns his head.

In case of Rh conflict, the administration of immunoglobulin is necessary. This helps to avoid many serious complications.

Week 29

The child continues to grow, and in the womb he becomes uncomfortable, because there is not enough room for him. The baby's height at 29 weeks of pregnancy reaches approximately 40 cm and weight 1.5 kg. The optic nerves are well developed, which allows the baby to better distinguish light and squint in bright glare. Many mothers feel the baby's hiccups and movements. The organs are well formed, the muscles and respiratory organs are improving.

Most girls are not forced to change their wardrobe, since their tummy no longer fits in old clothes. Don’t be upset, because you’ll soon be able to get back to normal.

Changes in a pregnant woman:

• the skin becomes drier, pigmentation is noticeable;
• in the back area are increasingly felt nagging pain, the woman gets tired quickly;
• The expectant mother often feels irritated. Due to the fact that she can only lie on her side during sleep, fatigue accumulates.

Despite fatigue and mood swings, mommy should remember the need to continue to eat properly, monitor weight gain, you can keep a personal detailed nutrition diary, and attend routine examinations. Pregnancy management should be carried out by an experienced doctor. If you do not visit the hospital, the outcome can be very negative.

Week 30

- this is seven and a half obstetric months. By this time, the woman gains up to approximately 10 kg, some mothers even more. At this stage, the baby is fully formed and continues to practice breathing. It draws fluid in and out, thereby preparing its lungs to draw in air.

This is where the tiny little man’s active interaction with his mother begins. He gets worried if a woman raises her voice and calms down when she strokes her tummy. The weight of the fetus is approximately 1.5-1.6 kg. He will need to gain about two more kilograms before giving birth. The hairs covering the baby's body begin to gradually disappear, but sometimes they remain for some time after the baby is born.

The grooves in the brain that have formed by this stage of development become deeper. Mommy feels that the baby is not just moving chaotically, but can consciously react to different kinds irritants.

At 30 weeks of pregnancy, the baby is increasingly running out of space. Every now and then he tries to straighten his arms and legs, which the pregnant woman clearly feels.

31 weeks

The fatigue and discomfort of the young mother is increasing more and more. The uterus grows and puts pressure on the internal organs. Back pain occurs while sitting, walking, even lying down becomes uncomfortable. Cramps often occur at night. To alleviate your condition, you should do yoga; a relaxing massage helps a lot. At this stage, doctors recommend reducing the amount of fluid consumed, maintaining a healthy diet, and limiting the amount of salt.

Physiological changes in a child are as follows:

• weight is approximately 1.7 kg;
• height reaches 40-45 cm;
• the baby’s basic senses improve (hearing, vision, smell);
• neural connections are increasingly developing;
• the period of wakefulness becomes longer.

The closer the upcoming birth is, the more the pregnant woman’s anxiety increases. Fears and worries are completely normal feelings, and family and friends should help you cope with them.

Week 32

At this stage of pregnancy, the baby's height is up to 47 cm and weight is approximately 1.8 kg. Many babies are still in a feet-down position, but they soon roll over into a correct position. Coordination of movements improves, the brain develops better. On latest dates During pregnancy, many doctors advise mothers to read books, listen to calm music, and recite poems to their children. It is believed that this helps to improve the development of the baby and make his psyche more stable.

A woman’s feelings at this stage of pregnancy can hardly be called pleasant. The uterus enlarges and puts pressure on the stomach, heart, and diaphragm. It becomes harder to breathe, the woman suffers from belching, heartburn, and it is increasingly difficult to find a comfortable body position.

Many women can feel contractions, but more often they are false. They are called Braxton-Higgs contractions. This is a kind of training before upcoming birth.

Week 33

The weight gain of a pregnant woman at this stage is approximately 12-14 kg. Due to the fear of the upcoming birth, the irritability of the young mother increases. To avoid various problems, a girl is advised to remain calm, communicate more with loved ones, and watch films about the birth and upbringing of children.

The child often turns head down. If this does not happen, do not be upset. Doctors will help you monitor birth process. The baby is rounded, cheeks and skin folds appear, and the skin brightens.

In the last trimester of pregnancy, the musculoskeletal system is actively developing. A woman should not forget about adequate calcium intake during this period.

34 week

Thoughts about the birth of a baby at this stage of pregnancy become more and more frequent. Meeting the baby is becoming more and more desirable. A girl’s body weight, as a rule, increases by 10-15 kg, her breasts fill out and continue to grow. The areolas become darker.

The baby weighs up to 2.5 kg. Fetal growth is up to 49 cm. The baby's skin brightens, becomes smoother, but is still covered with a protective lubricant. It is designed to facilitate its passage through the birth canal and protect against pathogenic microorganisms. If a child is born prematurely, he will be able to breathe on his own without a special chamber and rehabilitation.

Week 35

At this stage of pregnancy, mothers should take special courses that will teach them how to behave during childbirth. In addition, it is important to think about choosing a maternity hospital and a doctor who will monitor the birth process. Many women decide to partner birth. At the same time, a husband or another close person can poke his head into the delivery room.

When walking, fatigue and shortness of breath occur due to quite big belly. Doctors recommend not to overeat during this period. If the fetus is too large, the birth will be quite difficult.

At the 35th week of pregnancy, all reflexes will improve little man(sucking, swallowing, grasping). The amount of amniotic fluid becomes smaller, which causes discomfort to the baby. This becomes one of the first signals for the onset of labor. In the third trimester, the development of the respiratory, nervous, endocrine and other systems improves.

The fruit drops. In this case, the woman feels nagging pain in the back and lower abdomen. Soon after this, breathing becomes easier and discomfort in the back decreases.

36-39 weeks

At this stage, the child is fully formed. All organs and systems function in the right order. At this stage, the pregnant woman’s body is completely ready for the birth of a new life. At this stage, a woman should be able to distinguish false contractions from the true ones. The following signs indicate the onset of labor:

• increased appetite;
• contractions are of a regulatory nature;
• vomiting and diarrhea often occur;
• amniotic fluid leaves;
• the plug (mucus that covered the uterus) comes off.

If a pregnant woman develops such signs, she needs urgent hospitalization. The baby at that stage of pregnancy weighs from 3 to 3.5 kg. The baby's height is up to 55 cm.

The baby is formed and ready to be born. It is impossible to accurately calculate the date of birth and the sex of the child. The baby's date of birth can be calculated by knowing the first day of the last menstruation. This is the so-called obstetric period.

40 weeks

At this time, most mothers expect a long-awaited acquaintance with their baby. All organs and systems of the baby are fully formed, he will meet the outside world. The further growth and development of the child will depend entirely on the care of the parents for the little man.

On many websites and forums about pregnancy you can find various graphs of the development and weight gain of the baby in the womb. We propose to consider one of these development lines.

The data in the table is approximate and may vary depending on the developmental characteristics of the fetus.

Correspondence of weeks and months of pregnancy: table

The ratio of weeks and months of pregnancy in the table.

Trimester	Month	A week
First	1	1-4
	2	5-8
	3	9-13
Second	4	14-17
	5	18-21
	6	22-26
Third	7	27-30
	8	31-35
	9	36-40

The date of onset of labor is calculated by the doctor. The date of birth of the baby can be determined with an error of 2-3 weeks according to the obstetric period. In addition, there are special calculators that can be used to approximately calculate the baby’s due date.

Video about intrauterine development

This video will help you learn more about fetal development.

Congratulations, you are the most caring mommy, if you want to know about the development of the embryo by days from conception. This is useful because you can be aware of what is happening inside you. And the more we know, the less we panic over little things. Ready?

Pregnancy is generally divided into two main stages:

• Embryonic period It takes the passage of the sperm into the egg followed by intrauterine development and lasts up to the 9th week.
• Fetal period begins immediately after the embryonic stage and ends only at the stage of childbirth.

The entire period of a standard pregnancy lasts 9 months, and the period is calculated not according to the calendar month, but according to the obstetric month, which takes 28 days.

1 – 4 days

As soon as the sperm enters the cell, the process of division occurs. One cell turns into 2, and they already turn into 4. During the first 4 days, the cells do nothing but division. By the end of this short period, 58 cells will appear, which are called blastomeres. 5 cells are needed for the direct development of the fetus and the connecting umbilical cord. The rest are for food. At this stage, the growth of the embryo does not exceed 0.14 mm.

5 day

A blastocyst is a vesicle that appears on the fifth day. Liquid accumulates in the bubble. Over time, the blastocyst will grow.

6 – 7 days

The embryo should already be attached to the uterus. This is the so-called implantation. At this moment, the woman may be bothered (be sure to read), but this is completely normal and nothing to worry about. Although if they don’t exist, then everything is fine too. Discharge can simply warn that pregnancy has begun and now the body will adapt to the new period.

Day 8

The embryo is already inside the uterus and feeds on substances from the blood of the mother’s body.

Second and third weeks

The second and immediately third weeks, which include days 9 to 21, are the period of active formation of the placenta, umbilical cord, and neural tube. As for the latter, it is where the nervous system begins.

Each stage is important in its own way, but it is in the second and third weeks that the foundation of the future organism is laid. That's why it's so important. It helps in the formation of all major organs.

And the most important thing at this stage is that the heart begins to beat.

Fourth week

By day it is 22 – 25 days. Now the rudiments of the brain, pancreas, lungs, and liver are being formed. The basis appears for the formation of arms and legs in the future. At this stage, the neural tube has already formed and the nervous system is formed from it. Folic acid is still extremely important.

Fifth week

Days 29 – 35 are already the second month. At this time, the most important organs appear. In the digestive system, the liver and pancreas are already fully formed, in the respiratory system – the trachea, larynx and lungs. There is already a hematopoietic system.

Eyes have appeared, which are located on the sides even in the embryo. Later they will take their usual position for us. The inner ear is formed.

In the nervous system, attention is focused on the brain, its departments are now being formed.

Sex cells are just beginning to appear in the reproductive system, but nothing can be said about a specific sex yet.

The arms and legs are already forming with all their might, even the nail plates are appearing. The barely noticeable umbilical cord is gaining momentum.

At this stage, the weight of the embryo barely reaches 0.4 g.

Sixth week

From days 36 to 42 in the sixth week, the placenta appears. It is not yet connected by blood circulation to the embryo.

The encephalogram is already able to record the first signals from the brain, because it is already developing with might and main.

Muscles appear on the face, the eyes are more noticeable, but they are not yet covered by eyelids. Fingers appear on the hands.

The heart, which is already beating with might and main, forms chambers. The kidneys and ureters are formed.

As for the digestive system, after completing work on the pancreas and liver, the cells build the intestines and stomach.

Seventh week

Between the 43rd and 49th days, the umbilical cord has already formed. Together with the placenta, they provide the fetus with air and food. The hormonal system is activated, which affects the mother’s breast enlargement.

The body is still poorly developed, and most of the body is occupied by the head. There is a tail in the pelvis, which will then disappear. The fingers are already formed, but not yet separated. The first spontaneous movements of the hands appear.

At the seventh week, the mouth already opens and there are eyelids for the eyes. The nose and ears are formed.

Eighth week

These are days from 50 to 56. The body is growing, the lips, eyes and nose are well drawn. If it is a boy, then the testicles gradually develop. The fingers are already separated. The bones become harder.

Day 56 – fetal growth barely reaches 20 mm. It looks no bigger than a chicken egg and consists of 97% liquid.

At this stage, the embryo is already considered a fetus. All the main organs for life have been formed and now the stage of their improvement begins.

Third month

57 – 63 days

From the third month of pregnancy, reflex movements appear. The cartilages of the larynx and ears are noticeably formed. The adrenal glands even produce hormones. The brain continues its active growth.

The heart is capable of producing 150 beats per minute, and it is already pumping blood through the vessels.

At this stage, there are only red blood cells in the blood, but no leukocytes yet, so the fetus’s body is protected from infections by the mother’s body. This is the so-called passive immunity.

The fingers can already clench because the joints are formed. The fetus makes its first movements.

64 – 70 days

It's time for the ponytail to disappear. The buttocks are actively developing.

The respiratory system is almost formed and is even ready to work independently.

Movements are no longer chaotic, but react to external stimuli. The mother will not feel this yet, because the size of the fetus reaches a maximum of 40 mm, but if you press on the areas of the uterus, the fetus will bend an arm or leg. Can turn his head.

71 – 77 days

Now the eyes are not only formed, but the iris has already been drawn. This means that the baby already has a certain eye color.

At this stage, the expectant mother may experience slight discomfort, for example, weakness, pressure, nausea. This is due to the development of hormones.

78 – 84 days

Remember when we said that there are no leukocytes in fetal cells yet? Now they appear and are able to protect the body of the unborn baby. The body parts are already formed and clearly visible.

Fourth month

85 – 91 days

Now all the internal organs in the fetal body are fully formed. The child begins to have overactive skeletal growth, and if there is not enough calcium in the mother’s body, it’s time to replenish it.

92 – 98 days

Eyebrows and eyelashes appear on the face of the unborn child. The baby can make facial movements for the first time.

You can already hear the heartbeat if you use an obstetric stethoscope.

99 – 105 days

Now is the time for gender formation. Meanwhile, the pancreas is already coping with the production of insulin.

106 – 112 days

The fingers and nails on them are already formed. If you look at the baby using an ultrasound machine, you can see how the child sucks his finger. By the way, at this stage of development, the baby can already distinguish smells and tastes.

Fifth month

Get ready for the first movements.

113 – 119 days

Teeth are just beginning to develop. They will not appear at birth, but their foundation is laid in the womb. The child already has hearing, which is why the baby may move slightly during loud sounds.

120 – 126 days

At this stage of development, the baby reaches a maximum of 190 mm. You can feel the baby moving.

127 – 133 days

Now not only you feel how the fetus moves, but others, in contact with the stomach, will feel it. By the way, if you are giving birth for the first time, then do not worry that you did not feel movements before; often in first-time mothers they appear on the 127th day.

The fetal blood is filled with a new composition - red blood cells, leukocytes, monocytes, lymphocytes.

134 – 140 days

The time has come for the formation of the fat layer. As for facial expressions, they continue to develop. Now the baby can smile, blink his eyes or frown.

Sixth month

141 – 168 days

The fetus is already large enough to occupy the entire uterus. The baby can react to light and sounds, and the emotions that the mother feels are felt by the baby. Be aware of how you feel, try listening to classical music and meditate.

The baby is able to swallow, so now he swallows amniotic fluid and lubricant, which protects the skin. This is normal and necessary for the intestines to function well. Lubricant and amniotic fluid are converted into meconium during the processing process.

Seventh month

169 – 196 days

Alveoli form in the lungs and look like deflated balloons. When the baby inhales air for the first time, the alveoli will straighten. Now they are still able to produce the surfactant that is required for their normal functioning.

If you are carrying a boy, the testicles descend into the scrotum. If it is a girl, then external genitalia are formed. The brain begins to become more and more active.

Eighth month

197 – 224 days

This month, the baby should take the position necessary for birth - head down. There are times when the baby does not roll over properly. Then . This question should definitely be clarified with your doctor.

Almost all systems and organs in the baby’s body hone their work so that at birth they can already function without the help of the mother’s body.

Since a child's eyes already react to light, the pupils may constrict and dilate. Please note that the tremors may only get worse.

Nothing phenomenal is happening now compared to the first days, but the mass is quickly gaining. The increase can reach up to 35 g per day.

Mom is also experiencing changes. A hormone is produced that causes milk to appear.

Surely you have already heard that children can be born in the 8th month. As you can see, the child’s body is quite capable of functioning.

Ninth month

225 – 252 days

Now time is ticking. Childbirth is about to happen. And the baby is preparing for this event. Its head, or rather, the cranial bones, are mobile enough to pass through the birth canal. The baby himself no longer turns around.

253 – 280 days

The baby's weight reaches 3.5 kg with a height of 0.5 m. Intrauterine development is completely completed and now the child is ready to be born.

This is how the embryo develops day by day from conception. Bookmark this page to always remind yourself of the journey your baby will take from the moment of conception. Take care of yourself.

Ultrasound diagnostics, or ultrasound, is a mandatory procedure during pregnancy. This is stated in the law. Now there is nothing surprising in the fact that you can see how pregnancy develops from the inside, but even 25 years ago in the now post-Soviet space, such a fact would have caused bewilderment. Only in the mid-90s of the last century did expectant mothers get the opportunity to find out if everything was okay with their unborn child, and doctors got the opportunity to control pregnancy and predict possible pathologies fetus

Ultrasound during pregnancy is performed using a special device, which, using ultrasound, striking a special sensor plate, displays an image of the fetus and its membranes on the screen. Recently, the so-called 3D ultrasound has become widespread; its peculiarity is that a three-dimensional image is displayed on the screen, the slightest details of the appearance of the unborn baby are visible. In the early stages of pregnancy, ultrasound is performed vaginally, later - abdominally, that is, through the abdominal wall.

Two ultrasound diagnostics are required throughout pregnancy. The first is carried out at 11-13 weeks, the second at 17-20 (21) weeks. In a normal pregnancy without pathological conditions, two ultrasounds are sufficient. The third ultrasound is performed in the middle of the third trimester, but recently only when indicated.

Mothers wait with special trepidation for every ultrasound, so it is not surprising that pregnant women often undergo more than the required diagnostic tests. Let's talk about what can be seen on an ultrasound at each stage of pregnancy.

Ultrasound: 1st week of pregnancy

Experts count the gestational age not from the day of conception, but from the first day of the last menstruation. Therefore, the first week of pregnancy is not yet pregnancy, but the body is actively preparing for it. Now on an ultrasound you can see that the uterine cavity is slightly enlarged, because menstrual blood and dead endometrial cells accumulate in it. Small antral follicles are visible. At this time, a natural decline in the hormone estrogen occurs in the woman’s body, due to which follicle-stimulating hormone (FSH) “forces” several follicles to mature.

Ultrasound photo 1 week of pregnancy

Ultrasound: 2nd week of pregnancy

Now the ultrasound will show a dominant follicle, the diameter of which can be 17-30 mm. Immediately before ovulation, you can see a special tubercle in it - the process of maturation of the egg takes place in it. The mucous membranes of the uterus at this stage become thicker.

Ultrasound photo 2nd week of pregnancy

Ultrasound: 3rd week of pregnancy

Ovulation occurs and the egg travels into the fallopian tubes, where it looks for the most “successful” sperm. Now comes pregnancy. However, the ultrasound machine is not able to see the future embryo, since it is still too small. The third week of pregnancy is critical, since due to a lack of hormones, the body can again start menstrual bleeding, which will “wash away” the fertilized egg.

Ultrasound: 4th week of pregnancy

At this stage, an ultrasound scan already shows the presence of pregnancy. It is a small black circle, the diameter of which is only a few millimeters. This is the fetal sac. Ultrasound diagnostics in the fourth week of pregnancy notes dilation of the uterine vessels. This is the norm.

Ultrasound: 5th week of pregnancy

Now the unborn child is an oval with a tail and head. At this stage, the ultrasound can already clearly see it. Doctors are already calling it an embryo. The heart, spinal cord and brain begin their active development. Ultrasound records distinct contractions of the developing heart. However, this is not yet the heart that we are all used to seeing; for now it is a pair of contracting channels called heart tubes.

Ultrasound: 6th week of pregnancy

An ultrasound this week of pregnancy will show an embryo that has already grown and is now the same size as a pea. At the sixth week, the ultrasound specialist measures its size, from the crown to the tailbone. This size can be used to supply the most exact date pregnancy and determine the most likely date of birth. The size of the uterus increases slightly. Presence of pregnancy this period can also be installed during an external ultrasound - that is, through the abdomen.

Ultrasound: 7th week of pregnancy

The embryo became 10,000 times larger than its size at the time of conception. The heart continues its active development. The ultrasound machine records the heart rate, normally up to 160 beats. You can see how the limbs of the future baby are actively forming. The formation of the tongue and mouth is now taking place. The embryo has kidneys that excrete urine. They are formed from three parts.

Ultrasound: 8th week of pregnancy

The size of the embryo is approximately 12-14 millimeters. Limbs become stronger and longer. The eyelids begin to form. Already formed ovaries and testicles are laid, depending on the sex of the unborn child. The movements of the embryo become more active.

Ultrasound: 9th week of pregnancy

Now the embryo does not have a tail and it bears the proud name - a fetus. This week's ultrasound will measure the thickness of the placenta. The umbilical cord begins to be more clearly defined. Bone and cartilage tissue is formed. Ears are visualized. The limbs of the fetus are now taking on more familiar shapes to us. However, the fetus's fingers are still webbed.

Ultrasound: 10th week of pregnancy

The fruit continues its intensive development. At nine weeks ultrasound, it is about the same size as a small plum. At this stage it is actively developing skeletal system. The ultrasound shows how the future baby bends and straightens his arms at the elbows. The gums contain already formed teeth.

Ultrasound: 11th week of pregnancy

Ultrasound shows a fetus whose head is the same size as its body. This is fine. During this week, the fetus became twice as large compared to the previous week. Now the fingers do not have membranes between them and good device they can even be counted. The irises of the eyes are formed. Hair follicles begin to grow on the fetal head, marigolds begin to grow on the arms and legs, and ovaries develop in girls. The ears, nose, palate and tongue are now fully formed.

Ultrasound: 12th week of pregnancy

The deadline for the most important ultrasound has arrived. At the twelfth week of pregnancy ultrasound diagnostics is mandatory examination. During the examination, in addition to the size of the fetus, measurements are taken of the head, humerus, ulna, femur, radius, tibia and fibula. The symmetry of the limbs and their motor activity, the presence of a correctly located heart and stomach are assessed. During an ultrasound scan at this time, it is possible to diagnose possible heart defects with a high probability. The thickness of the collar zone is now being measured. Normally, it is no more than 2.5 millimeters; a larger value suggests that the fetus has a chromosomal abnormality such as Down syndrome. The doctor carefully examines the nasal bones of the fetus. It has been noted that people suffering from Down syndrome have a shorter nose, since the nasal bones with this pathology complete their formation much later than in a fetus without pathologies. So visualization of the nasal bones on ultrasound at 1 week is a very important indicator.

Ultrasound: 13th week of pregnancy

At this stage the fruit is comparable to the size of a peach. He grows and all his internal organs improve. Now happening active formation vocal cords. The fetal gallbladder and liver begin to produce bile, and the pancreas produces the most important hormone - insulin. The liver, spleen and bone marrow produce red blood cells. The bone marrow also actively produces leukocytes - white blood cells, which are responsible for the formation of the immune system of the unborn baby. On an ultrasound at 13 weeks, hair on the fetal head is already visible, but there is still no pigment in it and therefore it is white, almost colorless.

Ultrasound: 14th week of pregnancy

The fetus grew to the size of its mother's fist. An ultrasound at 14 weeks of pregnancy shows that all the internal organs of the fetus have already taken their final position inside the abdominal cavity, and do not protrude in the form umbilical hernia, as it was just a few weeks ago. Ultrasound can already distinguish even the pattern on the palms of the fetus. The face takes on a more defined shape. The length of the neck becomes longer. The fetus begins to actively suck its fingers - this is the formation of a natural reflex.

Ultrasound: 15th week of pregnancy

This week the uterine muscle layer is assessed. Normally it is thin and uniform.
The fetus becomes more and more like a person: the ears and eyes move to their natural places. The fetal hair begins to acquire pigment and very soon it will become clear what color it will be after birth. The baby begins to swallow amniotic fluid. This is fine. In this way, the baby prepares for life outside the womb.

Ultrasound: 16th week of pregnancy

At this stage, ultrasound takes measurements of the placenta. Now its size is approximately 18 millimeters. The umbilical cord already fully ensures the delivery of nutrition and oxygen to the fetus. The baby begins to hiccup. At 16 weeks of pregnancy, you can already accurately determine the gender of the unborn baby.

Ultrasound: 17th week of pregnancy

The time has come for the second mandatory ultrasound examination. Measurements are taken from the long bones of the fetus. At week 17, the device examines the fetal heart to completely rule out possible defects in the development of this vital organ. They evaluate the great vessels that leave the heart, and also look at the structure of the kidneys.

Ultrasound: 18th week of pregnancy

This week, an ultrasound will determine the weight of the fetus. On average, an embryo at the eighteenth week of pregnancy weighs 230 grams. Weight is calculated based on fetometric parameters. Measurements are also taken of the abdominal circumference, fetal head, and fronto-occipital region. The fetus's body begins to produce meconium, its waste product.

Ultrasound: 19th week of pregnancy

Permanent teeth begin to form in the gums of the fetus. An ultrasound at this stage clearly shows his jaws. This is important because their shape and size can tell a lot about the possible presence of chromosomal abnormalities. The fetus actively “works” with its fingers, although they are still not fully developed.

Ultrasound: 20 weeks of pregnancy

The fruit already weighs 400 grams and its length is about 20 centimeters. At this stage, in boys, the testicles begin to descend into the scrotum, and in girls, a mass of simple eggs has formed. On an ultrasound you can already see the baby yawning. He has already established a daily routine like a newborn.

Ultrasound: 21 weeks of pregnancy

This week, all the same fetometric parameters are measured as in the 20th week of pregnancy. The ultrasound shows that the fetus's legs are stretched. Due to this, the proportions of his body become more harmonious. Now all internal structures of the fetus are measured.

Ultrasound: 22 weeks of pregnancy

The basic structures of the fetal brain are studied. IN mandatory examine the cerebellum. The fetal nervous system has almost completed its formation. The integrity of the spinal cord and spine as a whole is studied. The future baby can already distinguish the times of day very well.

Ultrasound: 23 weeks of pregnancy

Ultrasound at this stage measures the weight of the fetus, often it is at least half a kilogram! All fetal bones are measured. It can be seen that a layer of fat begins to form under the skin. If labor suddenly begins now, it will no longer be a miscarriage, but a real birth and the baby can be delivered.

Ultrasound: 24 weeks of pregnancy

The placental structure is assessed. Normal placenta homogeneous structure. An ultrasound scan looks at the arterial blood flow of the umbilical cord, and also evaluates the umbilical artery. The degree of maturity of the placenta is determined. The weight of the fetus is already more than 600 grams.

Ultrasound: 25 weeks of pregnancy

The most important thing to look at on the ultrasound this week is the amniotic fluid and its quantity. All bones of the child are measured. The child's spine is already fully formed. The baby’s nostrils are now open, although a week ago they were tightly blocked. The baby reacts with active movements to familiar voices.

Ultrasound: 26 weeks of pregnancy

Ultrasound evaluates the structure of the fetal brain and its facial areas. The weight of the fruit is about 900 grams. The device records the opening of the child's eyes. However, he still sees imperfectly, able to distinguish only light and darkness. The irises of his eyes are not yet pigmented.

Ultrasound: 27 weeks of pregnancy

During this week of pregnancy, an ultrasound is done to assess the dynamics of fetal growth and weight gain. The symmetry of the limbs is assessed to exclude possible pathologies of the development and structure of the fetus.

Ultrasound: 28 weeks of pregnancy

The last, third trimester of pregnancy has begun. The fruit weighs more than a kilogram. An ultrasound evaluates its size, as well as its position inside the uterus. From this week, the baby begins to take the position from which it is most likely to be born. However, even if the doctor said on the ultrasound that the baby is lying incorrectly, this is not a reason to worry - the uterus is still free enough to take the correct position.

Ultrasound: 29 weeks of pregnancy

The examination determines the child’s body weight. It is believed that at this stage he weighs half as much as he will weigh after birth. The bone marrow actively produces red blood cells. All the baby's bones are already fully formed.

Ultrasound: 30 weeks of pregnancy

The baby's diaphragm contracts in preparation for life outside. mom's belly. The pregnant woman feels these contractions. An ultrasound at this stage assesses the amount of amniotic fluid, as well as the size and weight of the baby, which, by the way, can already weigh one and a half kilograms.

Ultrasound: 31 weeks of pregnancy

An ultrasound should be done this week to make sure the baby is developing at a normal rate. Fetometry of fetal bones and structures is performed. Now is the time to appreciate the state of kidney development.

Ultrasound: 32 weeks of pregnancy

Blood flow in the umbilical arteries is assessed. If deviations from normal indicators, at the same time, the pregnant woman will undergo Doppler testing - an assessment of all the arteries of the uterus, the arteries of the child’s brain and his aorta.

Ultrasound: 33 weeks of pregnancy

At this stage, an ultrasound shows the degree of maturity of the child’s lungs. In practice, the baby’s lungs are ready for life outside the mother’s body, but in fact it will be better if he grows a little more in the uterine cavity. The liver begins to accumulate personal iron (hemoglobin), which the child will need so much after birth.

Ultrasound: 34 weeks of pregnancy

The child's growth and development continues to be assessed. The ultrasound shows that the baby has become even bigger and stronger. Bones continue to actively accumulate calcium, due to which they become stronger.

Ultrasound: 35 weeks of pregnancy

Despite the fact that the child, in principle, may well be born safely, his brain is still actively developing. On ultrasound, special inclusions in the child’s bones become noticeable - the so-called ossification nuclei. At this stage, most often the child takes his final position.

Ultrasound: 36 weeks of pregnancy

Using an ultrasound, a specialist assesses the position and size of the baby’s head. Most likely, the head is located in the lower part of the uterus. Fat continues to accumulate under the skin.

Ultrasound: 37 weeks of pregnancy

The amount of amniotic fluid in the uterine cavity is measured. Also, using ultrasound, the functioning of all internal organs child. The child is actively gaining weight.

Ultrasound: 38 weeks of pregnancy

The fetus is now considered full-term. With the beginning of this week, you no longer have to fear for the baby’s life. The purpose of ultrasound at this stage of pregnancy is to assess the degree of maturity of the placenta. The baby's head circumference and chest circumference are also measured. Normally they should be the same in diameter.

Ultrasound: 39 weeks of pregnancy

An ultrasound evaluates the umbilical cord, its length is measured, and attention is paid to whether the child is entangled in it. Placental maturity is assessed again.

Ultrasound: 40 weeks of pregnancy

This is the last week of pregnancy, but there are women who give birth somewhat later than this period. So they perform this ultrasound, which evaluates the amniotic fluid and its quantity, the location of the umbilical cord, and also measures the weight of the child. According to statistics, more than 40% of women give birth before this period.

Ultrasound at 41 and 42 weeks of pregnancy estimates similar indicators as at 40.

Of course, every expectant mother wants to know exactly how her future baby is developing. However, in the normal course of pregnancy, it is enough to undergo 2 mandatory ultrasounds in the first and second trimesters, possibly at the very beginning, to confirm pregnancy in the uterine cavity.

All future parents are, of course, interested in what happens to the baby under the mother’s heart, how it emerges from a tiny cell little man, who in forty weeks will have to make Mio happy with his first cry. The most detailed pregnancy calendar offered on this page will help you get an idea of ​​all the processes occurring during the many months of intrauterine development of the embryo.

Pregnancy calendar from the day of conception (from 1 to 5 weeks)

1-3 weeks

The pregnancy calendar begins from the day of conception, when the egg is fertilized and moves through the fallopian tube, as well as implantation in the uterine cavity. Usually during this period the woman does not feel any changes in her body.

4-5th week

4-5 weeks from conception according to the pregnancy calendar is characterized by the beginning of the formation of the placenta. Intensive division of embryonic cells, laying of cardio-vascular system. He has a two-chambered heart, which is typical for fish, but this is a temporary phenomenon. By the end of the week it is already declining. The laying of the upper ones begins respiratory tract, neural tube.

The embryo develops homoblasts - prototypes of sperm or eggs. The optic cup acquires a double wall and is covered with a transparent cornea - eyes are formed. During this period, the formation of the adrenal glands, liver, duodenum, pharynx and esophagus, the formation of the mouth begins. The future stomach descends down into the abdominal cavity and becomes overgrown with nerve elements. This is essential for normal passage of food through the stomach. The formation of the salivary glands also occurs. By the end of the 5th week, according to the pregnancy development calendar, the embryo will develop the rudiments of the liver and pancreas.

If you were able to look at an embryo this week during an ultrasound examination, you would certainly see its head and pelvic end, back, tummy, spine and even eyes. The length of your baby during this period is 0.5-1.1 cm.

Embryonic calendar of early pregnancy from 6 to 10 weeks

6th week

Only one more week has passed, but it has brought so much. From a fish, the baby turned into an amphibian, the embryo developed an interatrial septum, which divided the heart into three sections, the kidneys and spleen were formed in the form of a cluster of special cells, the stomach was released from the expansion of the primary intestine, and the posterior intestinal membrane straightened. According to the pregnancy calendar, already in the early stages, the primary cerebral vesicles are transformed into the main parts of the brain, under which the epiphysis (pineal gland) appears, which affects puberty, normal functioning of the gonads. The rudiments of arms and legs appear, and separate parts of the inner ear and larynx are formed. The placenta (baby place) is developing rapidly and a tiny umbilical cord has already appeared. Your baby's length is 1.2-1.6 cm.

7th week

According to the pregnancy development calendar, at the 7th week the length of the embryo is already 1.6-2 cm and the weight is 4.5 g. This is due to the rapid development of the brain. But it is still bent, the head end is inclined towards the stomach, the tail has lengthened and curled. Outwardly, he becomes like a small, peacefully sleeping animal.

Gradually, the future facial features of the child begin to appear in the front part of the head. The eyes have already appeared, the formation of the lens, the formation of the nose, the rudiments of the auricle and the organ of hearing - the ear vesicle - begin. The first occipital and last 5-7 tip somites will disappear a little later, and the rest will form the axial skeleton. The heart takes an S-shape. The right and left ventricles are distinguished in it, it contracts, and with the help of ultrasound examination you can hear the heartbeat. The esophagus, trachea, and anterior abdominal wall develop. The process of formation of the small intestine and sternum is underway. The cortical part of the adrenal glands is laid. The brain develops very quickly; now, like that of an adult, it has grooves and convolutions. The muscles of the whole body are formed. The nose and mouth and lobar bronchi continue to develop. The primary circulatory system begins to function. The “commander-in-chief” in this process is the liver, from which blood cells enter either the right or the left parts of the heart, so
o Possibly due to a large foramen ovale in the cardiac septum. But all this is temporary. With the formation of lymph nodes, immunity begins to form. The buds acquire their final shape and permanent structures. The rudiments of the parathyroid glands are formed. Cells with characteristic endocrine properties appear in the pancreas. The lower part of the intestinal tube is divided into two sections, from which the small and large intestine will later form. The limbs of the future baby lengthen, become thinner, hands and feet appear on them, and you can even see 5 small rays - a prototype of fingers.

8th week

The size of the embryo, in accordance with the pregnancy calendar, at this stage has already increased sufficiently - up to 2.2-2.4 cm, and weight - up to 23 g.

Its upper and lower jaws are formed from the first gill arch. You can already see the contours of the nose, the forehead is developing, the outer contours of the eyes are outlined, which become more noticeable as pigment appears in the retinal cells. The head of the embryo is tilted towards the cardiac protrusion, which gradually decreases due to the development of the chest; by the end of the week, the neck and torso begin to gradually straighten. The volume of the abdominal cavity increases, the hepatic protrusion disappears. The stomach and intestines take their final shape and take their permanent place. A primary intestinal loop is formed. The umbilical cord develops. The central lymphatic organ - the thymus (thymus gland) is formed, the first follicles appear in the tissue thyroid gland. The epidermis becomes more complex, as two layers of cells appear in the skin, and the common arterial trunk is divided into the pulmonary artery and the aorta. A second septum appears in the heart, separating the left and right ventricles. Together with the atrial septum they create
first valve. From this moment on, blood can move only in one direction - from the right atrium to the left. The communication between the heart and large blood vessels improves. The largest area is occupied by mesonephros ( primary buds), metanephros (secondary kidneys) begins to develop.

As you can see in the photo of the pregnancy calendar, this week the arms and legs are already well different from each other:

On the handle you can see the ulnar fossa and wrist, and on the hand (like a small child's shoulder blade) - future fingers. Changes on the legs occur much slower than on the arms. Bones and even joints develop very actively. It is during this period that skeletal ossification begins, which will continue for many years after birth.

If at the 8th week of intrauterine development the Y chromosomes begin to influence the fetus, then its gonads form into testes; if not, then into ovaries. In the first case, a boy will be born, in the second, a girl.

9th week

The length of the embryo from crown to tip is 2-3 cm, and the weight is 34 g.

The main feature of this week according to the pregnancy calendar is that the embryo takes on a clearly defined humanoid appearance: it has a head, torso and limbs. The head has become even larger, which is associated with the intensive development of the brain. This week the ears begin to grow, and although they are still located quite low, they will soon take shape and take their rightful place. Limbs are actively forming. Arms and legs lengthen, bones become stronger. The fingers on the limbs become stronger and longer. On the hands the fingers are separated by spaces, and on the feet by grooves. The baby's body grows not only in length, but also in width. The volume of the chest and abdominal cavities increases, which leads to smoothing of the cardiac protrusion. In the small intestine, proteolytic enzymes appear that are involved in the process of breaking down proteins into amino acids, which are well absorbed. The first ones appear, located on the palms and soles, sweat glands. The nervous system is actively developing, in the intervertebral foramina there are nerve nodes (spinal ganglia), cranial and spinal nerves are clearly visible. By the end of the week, the formation of the cerebellum will begin; it is this part of the brain that is responsible for coordinating movements. The adrenal medulla is formed (it produces adrenaline). And one more joyful event - it is from this week that the first, still completely invisible to the mother, spontaneous symptoms begin.

Week 10

At this stage of pregnancy, according to the calendar, the length of the embryo from the crown to the buttocks is from 3.0 to 4.1 cm, and it weighs 45 g. This is the last week of the embryonic period of human intrauterine development. There are significant changes in body proportions, they clearly take on a human appearance. The head rounds and rises. It is still very large and accounts for almost half the length of the entire body. The skin is very thin, so the blood vessels of the skull are visible. The neck appears. On the face you can see the brow ridges and eyelids, which close by the end of the week. The embryo's eyes are wide open at the beginning of the week. The mouth becomes smaller, and a small tongue is visible inside it. The development of baby teeth has begun. By the end of the week, the embryo is able to distinguish taste. The tail finally disappears. The arms and legs are almost the same size, all sections are clearly visible on them, while the arms are bent at the elbow joints, and the legs are at knee joints. The umbilical cord decreases in diameter. The yolk sac, which previously performed a hematopoietic function,
gradually dies off. Its remains are later found as part of the umbilical cord. With the appearance of the placenta, blood circulation, nutrition, and metabolism improve. In the embryo, the relative position of the organs changes, so the kidneys rise up and begin to gradually, in very small quantities, filter substances harmful to the body from the blood and remove them, i.e., form urine. The differentiation of the internal genital organs begins; in future boys this process has already begun, but girls are in no hurry. The cerebral cortex is well defined. The volume of bone marrow is 16 ml. The first lymphocytes appear in the blood, thymus gland, and lymphatic follicles - white blood cells responsible for immunity. The amount of amniotic fluid inside the amniotic sac is 20 ml. These are quite comfortable conditions for the life and development of the embryo.

From the end of the 10th week according to the calendar, pregnancy ends embryonic period intrauterine development of a person, the fetal (fetal) period begins. Now we can call the organism developing in the uterus a fetus.

Accurate pregnancy calendar for the period from 11 to 15 weeks

Week 11

According to the pregnancy calendar, fetal development at this stage continues very quickly. Its length is 7 cm, and its weight is about 50 g. The appearance of the fruit is very unusual, the head makes up almost half the length of its entire body. The arms appear longer than the legs as they develop faster. The development of fingers and toes continues, and nails begin to form. This week, the first manifestations of facial expressions are revealed, the facial muscles of the face begin to work: the fetus opens and closes its mouth, wrinkles its forehead, and turns its head. The formation of the iris occurs - that part of the eyeball by which we judge the color of a person’s eyes. The pituitary gland, a multifunctional endocrine gland of the brain, located in the so-called sella turcica, begins to work at full capacity.

The thymus, the central immune organ, continues its work - hematopoiesis, the cells it produces (thymocytes) begin to spread throughout the fetal body.

This week the first significant lymphatic vessels appear in the region of the roots of the lungs. In blood vessels, immature blood contains primitive hemoglobin, which is gradually replaced by fetal hemoglobin.

After the 12th week of intrauterine development, new organs in the fetus are no longer formed, and existing ones continue to grow and develop. This week he begins to develop his first reflexes.

Week 12

Development is in full swing. The length of the fetus from the crown to the buttocks is 7-8 cm, and the weight is 68 g. All organs are already formed and continue to develop. The development of the fetus according to the pregnancy calendar this week is characterized by the fact that the fetus begins to form bone substance. The fingers and toes are separated and the nails continue to grow. The rudiments of permanent teeth form in the gums. Brain development continues. The pituitary gland produces many hormones. The fetal liver begins to produce bile, a substance essential for the digestion of dietary fats. Periodic contractions occur in the intestines, called peristaltic contractions. It is with their help that food moves through the intestines. The internal genital organs of the fetus are already developing in a female or male type. By ultrasound examination An experienced specialist can determine the sex of the child at this time. But take your time, wait until these differences become clearer. The fetus begins to move, but you don’t feel it yet. He may squint and wiggle his fingers and toes.

Week 13

The accurate pregnancy calendar symbolizes the 13th week as the second trimester of pregnancy. One third of the way has been completed. At the end of the previous trimester, the fertile period of development began. It is characterized rapid growth organs and tissues of the child, but a gradual slowdown in the rate of head growth. The body begins to grow much faster. And the second feature of this period is that congenital defects, as a rule, no longer form. This week, the fetus grows 9-10 cm and weighs 80 g.

Look at the photo - according to the pregnancy development calendar, at the 13th week the fetus takes on a human appearance, the eyes come closer together, the ears are located on the sides of the head:

His first hair appears, a delicate vellus called lanugo, located on the brow ridge, lip and chin. The baby has formed all 20 baby teeth. The intestines fit into the abdominal cavity. Villi begin to form in it, which play an important role in the digestion of food. The pancreas produces insulin.

Week 14

The length of the fetus is already 10-11 cm, and the weight is 90 g, the size of the head in diameter is 28 mm, the body continues to round. Active growth of the spine and muscular system continues. Muscle fibers begin to group and muscles are formed in which transverse striations predominate. Day by day there are more and more of them. The neck continues to stretch. The pancreas begins to produce more insulin, which is necessary for metabolism and growth. Sex differences are becoming increasingly apparent. Coordination of movements improves. The fetus begins to learn to breathe, draws amniotic fluid into the lungs and pushes them back. He knows how to open his mouth and even smile. At the same time, he may emit droplets of urine.

Week 15

To be precise, according to the pregnancy calendar this week, the length of the fetus is 12-13 cm, weight - 100 g. It is becoming more and more like a person. The ears are almost in place, the eyes are in the middle of the face, although still widely spaced.

Its skin is very thin, blood vessels are visible through it, and its color is more reddish than pink. The body is covered with vellus hair. The heart pumps approximately 2-3 liters of blood per day. The fetus periodically empties its bladder, and urine enters the amniotic fluid. Amniotic fluid is renewed 8-10 times a day, which helps maintain its sterility with a constant chemical composition: the ratio of water, mineral elements and organic substances. This is the very first habitat of the unborn child. He studies her, exchanges information and chemicals with her.

Baby pregnancy calendar with a description of fetal development from 16 to 20 weeks

Week 16

The fetus has grown and recovered, weighs 110-118 g and is working hard on its improvement. A nice fluff appeared on your head (before you know it, you’ll be braiding your hair). The ears are located almost in their place, a little closer to the neck. A special feature of the baby pregnancy calendar at this stage is the end of the formation of the nails of the unborn baby. His movements become more and more coordinated.

Week 17

The weight of the fetus is 160-180 g, length - 18 cm. New structures have not appeared, but how everything that the fetus already has is progressing in its development. The stage of increased brain growth has begun, its volume increases. From this moment, the formation of subcutaneous fat tissue begins, which is involved in energy production and in the metabolic process.

Week 18

The length of the fruit is 20-22 cm, weight - 200-250 g. Keep in mind that the growth rate by this time is slowing down a little. It should be. The formation of adipose tissue and the strengthening of fetal bones continue.

Pay attention to the photo of the pregnancy calendar - the phalanges of the fingers and toes have already fully formed in the fetus, and a strictly individual, unique pattern has appeared on the skin of the fingers:

The baby moves in his spacious “home”.

Week 19

The length of the fetus is 22-24 cm, weight - 280-300 g. Its lungs develop, bronchioles grow, and blood flow increases. His eyes are closed, but he knows how to distinguish light from darkness. Primitive eggs appeared in the girl’s ovaries. Now there is vellus hair on the entire body of the fetus. They will disappear shortly before birth, but sometimes their remains can remain in newborns on the ears, face, and shoulder blades.

Week 20

The length of the fetus is 24-25 cm, weight - 300-350 g. He already knows how to suck a finger. This week the skin begins to produce vernix. It is formed from exfoliating vellus hairs, superficial skin cells and the secretion of the sebaceous glands - white-cream in color. It is a paste-like substance that covers the folds and other parts of the body. Its function is to protect delicate skin fetus from exposure to harmful microorganisms and mechanical damage. Sometimes vernix lubrication persists after birth. During this period, the fetus moves very actively. If we take a watch, we get a stunning result - in half an hour he makes up to 60 pushes, and by the degree of this activity we can already judge whether he is sleeping or awake.

The newest pregnancy calendar from 21 to 25 weeks

21st week

According to the newest pregnancy calendar, at the 21st week the fetus has already grown to 26 cm and weighs 400-420 g. Its organs and systems continue to develop. First of all, this concerns the nervous and endocrine systems. The nervous system is already sufficiently developed for the fetus to swallow amniotic fluid without effort. Chemical composition, and therefore the taste of amniotic fluid largely depends on what the pregnant woman eats. Thanks to this, the fetus begins to develop food preferences that persist after birth. He behaves very actively, spins around as he wants, turns his head down, then up, then down again. He will become calmer only at the end of the second trimester.

Week 22

The fruit continues to grow and reaches a length of 27-28 cm and a weight of 500 g. All organs are already formed, but continue to actively develop and adapt to perform their functions. The brain has actually finished growing. The detailed pregnancy calendar notes that the vellus hair of the fetus becomes darker. Baby leads active life, and when he sleeps, he dreams.

Week 23

The fetus grows to 28-29 cm, its weight increases to 600 g. Original feces - meconium - appear in the intestines. This week the cardiovascular system is developing very actively.

Week 24

According to the pregnancy calendar, the length of the fetus at this stage is already 30 cm, and the weight is over 600-650 g. The baby continues to grow brown adipose tissue under the skin. This fat has high energy value. When describing the pregnancy calendar, the 24th week is characterized as the period of active development of the fetal nervous system. The volume of the brain increases, and central and lateral grooves appear on the surface of the cerebral cortex. The spinal cord grows much more slowly. The growth of muscle fibers occurs due to an increase in the diameter of existing fibers. The volume of amniotic fluid becomes larger. The baby begins to make breathing movements. In this case, a small amount of amniotic fluid enters the lungs, but is immediately absorbed by the lung tissue.

Week 25

The length of the fetus is 32 cm, and the weight is 650-750 g. Organs and tissues continue to develop intensively, especially respiratory system. The hematopoietic function is performed by the bone marrow. This week according to full calendar pregnancy is devoted to strengthening the osteoarticular apparatus, the fetus begins to move more actively.

Week 26

The fetus already weighs 800-900 g, its length is 34-38 cm. According to the pregnancy calendar, what happens to the fetus at this stage? Now he hears not only the beating of his mother’s heart, but also music from outside, since he has developed auditory analyzer. All organs and tissues continue to develop, the alveoli of the lungs have finally formed and the lungs have taken their usual position.

Week 27

The weight of the fetus during this period is 900-1000 g, length - 33-34 cm. Its skin is wrinkled due to being in an aquatic environment, but do not worry, this will pass a few weeks before birth. A significant event - the baby's eyelids rise. This week, the formation of the retina of the eye completes, so the child can perceive light and color.

The fruit is 35-36 cm long and weighs a little more than 1 kg. On the surface of the brain, grooves and convolutions are clearly visible, but there are not very many of them yet, but the mass of the brain has increased.

As you can see in the photo of the fetus according to the pregnancy calendar at the 27th week, the face of the unborn baby already has eyebrows and eyelashes, and small hairs on the head:

The baby opens and closes his eyes. A reflex arc has formed from the taste buds. Until this week, the boy's testicles were in the abdominal cavity, but now they are gradually beginning to descend into the scrotum. If it happens that the baby is born prematurely, then he has every chance of survival, naturally, with appropriate care.

Weekly pregnancy calendar of the last trimester

Week 29

Starts from the 29th week last trimester pregnancy. The length of the fetus is already 36-37 cm, and the weight is 1200-1300 g. During this period, it begins to work the immune system, blood cells are formed in the spleen. Enamel appears on the teeth.

The main task of the fetus at the moment is to prepare for childbirth. He learns to regulate his temperature. The bone marrow produces red blood cells. The nature of the movements changes - the fetus is pushed by the elbows and lower limbs.

30th week

According to the weekly pregnancy calendar, the fetus has already grown to 39 cm and weighs 1400-1500 g. It is familiar with the sensations of light and heat. His mother can determine with great certainty when the baby is sleeping and when he is awake. The hair on the fetal head continues to grow. The chest works very actively, it rises and falls.

31st week

The length of the fetus is 40-41 cm, and the weight is 1700-1750 g. White adipose tissue is deposited under the skin. The skin begins to take on a pink color.

The nails almost reach the tips of the fingers. The pupils of the eyes begin to react to light and darkness in almost the same way as in an adult.

Week 32

The length of the fruit is 42 cm, and the weight is 1800-1900 g. Most wrinkles disappear from the face. There is quite a lot of hair on the head. The nervous system continues to develop successfully. The head has become more proportional to the body. The fetal brain is cut through by convolutions. If light hits the face through the stomach, the pupils of the eyes begin to narrow.

Week 33

The length of the fetus is 42-43 cm, weight - 2000-2200 g. A special substance has appeared in the lungs - surfactant. It helps the baby breathe independently after birth because it prevents the lungs from collapsing during exhalation. Premature babies now have far fewer breathing problems.

34th week

Fetal height is 44-44.5 cm, weight is 2300-2400 g. The unborn child is developing intensively. He can already breathe on his own in case of premature birth, but cannot maintain body temperature. Fetal movements become more active.

The length of the fetus is approximately 45 cm and the weight is 2400-2600 g. From this week it will gain 220 g weekly. Soon he will begin to lower his head into the lower segment of the uterus. His nails are long and he can scratch.

Week 36

The length of the fetus is 46-47 cm, and the weight is 2700 g. It is preparing for feeding.

Below are photos of the fetus from the pregnancy calendar by week - you can clearly see how the baby sucks either a finger or a toe:

The fetus is no longer moving so actively, but you shouldn’t be afraid of this - it should be so.

37th week

The length of the fetus is 48-49 cm, weight - 2800-2900 g. The nervous system continues to develop, and a protective sheath is created around the nerves. This process begins this week of intrauterine development and ends by the end of the child’s first year of life. This shell allows for better coordination of movements. The baby's lungs are working actively, he is breathing with all his might. During inhalation, amniotic fluid enters his lungs, which is expelled when he exhales. Sometimes he gets hiccups. Now the baby should normally be head down in the uterus.

38th week

The baby continues to gain weight, now he weighs about 3 kg, and his length is 49-50 cm. But these indicators at the moment may be different. This largely depends on the height and weight of the parents themselves. The hair that covered it disappeared from the child's body, and the vernix lubrication became less.

The baby weighs 3000-3100 g, its length is 50 cm. All organs and systems are already fully formed and continue to improve. The respiratory system is the last to develop.

40th week

The development of the child according to the pregnancy calendar is completed at this point; he is already quite ready for extrauterine life. Its length is 51-54 cm, weight is 3200 g and more. His movements are becoming slower as he prepares for birth. The intestines are filled with black-green original feces. Both girls and boys have protruding nipples due to the high content of estrogen in the mother's blood. This will go away a few weeks after giving birth. The same reason can cause slight vaginal discharge in girls.

Now that you have read the full description of the pregnancy calendar by week, you can better imagine how your baby is developing in the womb.

This article has been read 24,421 times.