Embryo development stages

The origin of a new life is a real miracle. For 9 months of pregnancy, a real baby is formed from several cells, ready to be born. It is in the mother’s belly that the child develops with lightning force.

We can confidently say that this is his most important progress in life. Doctors indicate that with each week the baby acquires new characteristics and abilities.

First trimester human embryo

One of the most important stages in pregnancy is considered the first trimester. It is at this time that the vital organs are laid down. During the first trimester, the woman is under close medical supervision.

This is the time when miscarriages and numerous pathologies are possible. As a rule, girls report their pregnancy to others, being on the second trimester and knowing exactly that the most exciting stage is left behind.

Features of the 1st trimester after IVF

The hardest thing is for women who have undergone IVF. They have several times increased opportunities for the development of pathologies and miscarriage. The development of the life of the newborn after the IVF procedure begins immediately after fertilization has taken place.

A woman is told how many fertilized eggs have been planted in her body. The transfer of the egg does not occur immediately, but gradually. For some time, doctors ensure that cells are properly formed.

The decision to transfer a fertilized egg is taken at once by two doctors: a fertility specialist, who is responsible for the female body and its readiness for pregnancy, and an embryologist, who closely follows the development of the egg cell.

2 weeks after embryo transfer, the woman will know the result. It can be both positive and negative. The right way to determine pregnancy after IVF will be blood donation for hCG. It is a high level that will show that fertilization was successful.

How does the embryo develop?

21 days after transplant, doctors do an ultrasound scan. According to its results, it will be possible to judge the development of the infant in the mother’s body.

A woman in the first trimester after IVF should especially closely monitor their health and lifestyle. Unfortunately, not a single woman can fully influence the fertilization process, but she can ease it.

Try to rest as much as possible. But at the same time, staying in bed is not necessary. Be more often in the fresh air, take walks. Do not forget that you have to give up all bad habits: smoking, alcohol.

Include in the diet only healthy foods that are rich in vitamins. Eat as much seasonal fruits and vegetables as possible. That they contain the largest number of nutrients and trace elements. Do not abuse the pill, especially if they are not prescribed by a doctor.

Embryo growth weekly in 1 month of pregnancy

The first month is the time when the embryo begins to develop in the mother's body. Pregnancy has not come yet. As a rule, a woman does not even suspect about her future condition. In spite of this, 1 month is an important stage during which the stages of development of the future embryo are laid.

1-2 week

During ovulation, the female body secretes follicles, of which later an egg cell will appear. The follicles are found with the sperm, descending into the uterine cavity. This is the first stage of the birth of a new life.

3 week

The egg cell passes the stage of fertilization, starting to grow into the wall of the uterus. After that, the placenta and the umbilical cord gradually begin to form.

4 week

The stage when the embryo begins to form independently. During this period, the nervous system and the brain are laid down.

As a rule, it is on week 4 that a woman notices the absence of menstruation and, as a consequence, the onset of pregnancy. 4 weeks means that the cells turned into an embryo that is constantly growing. At this stage, it reaches the size of a poppy seed.

Embryo development at 2 months

2 month means a significant jump in the development of the fetus. Every week the embryo develops faster and faster, it forms vital organs. Gradually, over time, the usual embryo looks like a human being externally, laying the face, nose, limbs and fingers.

5 week

The transitional stage, which marks the end of 1 month and the beginning of 2 months of pregnancy. The embryo is getting bigger in size. At week 5, the neural tube, stomach, and trachea continue to form. Fledged circulatory system of the whole organism.

6 week

The size of the embryo reaches 6 mm. The extremities of the infant are still not developed. However, at this stage the brain is formed. The heart gradually enters the work. It is initially slightly reduced, driving blood through the entire system. It is still impossible to talk about the full-fledged work of the heart, but the bookmark of its functioning occurs at this particular time.

7 week

Every week the embryo becomes more and more growth. It increases in size exactly 2 times. But at the same time, if you look at its appearance, you can see that most of the development falls on the head and the upper part.

At this time, the child looks disproportionate, having a large and heavy head and very small lower limbs. Formed hands and fingers. The legs still resemble a ponytail.

8 week

The size of the embryo reaches 20 mm and it takes only a couple of weeks. The face of the child resembles a person; you can see his eyes, eyelids, nose and ears. Formed a brain that works with the two hemispheres, the nervous system. The remaining organs are gradually developing. For example, the beginnings of the lungs, heart, and digestive system appear.

The development of the human embryo.

How does the fetus develop by weeks at 3 months?

The embryo increased in size several times compared with the previous month. However, its development continues. As before, most of the body is the head, but it is already becoming more proportional. Bone tissue begins to form, thus the embryo has the opportunity to move his arms and legs a little.

Week 9

By the end of week 9, the size of the baby reaches 30 mm. Accordingly, the embryo continues to grow rapidly, increasing in size. The heart of the child is actively working, making 110-120 beats per minute. The head is still tightly pressed to the chest, and the child is in a slightly bent state.

10 week

The size of the embryo reaches 40 mm. The formation of the buttocks. The embryo floats inside the abdomen, starting from the walls of the uterus. At the same time, the woman still does not feel the movement of the fetus due to its small size.

11 week

The brain enters into active work, forming nerve endings and new neurons. Milk teeth and bone tissue are laid. The embryo involuntarily begins to clench and unclench fists, moving in the womb.

12 week

Last week of the first trimester means active formation of the placenta. It is extremely important for the development of a healthy newborn. With its help, the embryo will receive all the necessary nutrients, saturated with oxygen.

Embryo development stages in the 2nd trimester

The first trimester laid all the vital and necessary organs. The task of the second trimester - to improve all body systems.

How does the embryo change by day at 4 months?

The embryo gradually becomes like a human. Head and torso become more proportionate. At the same time, all human organs are being improved.

At the beginning of the second trimester, the woman is first screened. During an ultrasound study, a specialist can determine the gestational age, understand how well an embryo is developed, and identify existing pathologies.

At week 14, the body's locomotor system begins to actively develop. From week 14, the reproductive system is gradually being formed. In girls, the ovaries appear, in boys, the prostate gland.

By the end of the 15th week, the baby’s height reaches 12 cm. All organs have already been formed, the kidneys are working, which produce urine. The facial muscles begin to work, thanks to this, the kid can make grimaces.

Pregnancy in the 5th month

The baby has grown in size, now the expectant mother can feel his movements. First-timers feel the tremors at about 18-19 weeks of pregnancy. Repeaters can understand that the fetus is already moving at 16 weeks.

From week 17, the infant’s own immune system is formed. Now it is protected from external influences not only by the placenta, but also by its immunity. From the 18th week the limbs actively grow, the head becomes more proportional. The structure of the brain improved.

Since the floor has already been formed, from 19 weeks the thyroid and sex glands produce hormones. The skin is not so pale and transparent. It is becoming more dense and reliable. Every day there is more gun on the head and the whole body of the baby.

6 month: how does a human embryo change?

6 month marks the active work of the brain and the formation of the facial part. If you pay attention to the appearance of the embryo, it is fully consistent with the newborn baby.

From 21 to 24 weeks the weight of the child reaches about 530 grams. His height is 32 cm. Researchers believe that from the 23rd week of pregnancy the baby begins to have dreams. He actively responds to external stimuli. He may not like a loud voice, loud noise, a strong smell.

Often, the baby shows its dissatisfaction in the form of shocks. The child tries to learn all that surrounds him. For example, he pulls the umbilical cord, trying to understand where he is and how everything is arranged here. The kid already during this period shows high curiosity.

Embryo development weekly in the 3rd trimester

The final stage of pregnancy is the third trimester. Women are very often difficult to tolerate because of the pounds they have gained, low back pain, edema and accumulated fatigue. It is during this period that, according to the Law of the Russian Federation, a sick-list is given when a woman can take a break from work and accumulated duties.

During the 3rd trimester, the embryo actively accumulates subcutaneous fat, the formation of all the organs and the development of the infant's body itself is completed.

Growth of the baby by the end of 3 trimester reaches 50-55 centimeters. It is precisely such that newborn babies are born. As for weight, then everything is individually. On average, the indicator ranges from 3 kilograms and above.

Before the 37th week of pregnancy, the formation of the bone, nervous system, cartilage and the skeleton itself takes place. After this period, starting from the 38th week of pregnancy, the baby is preparing for birth.

The position and development of the fetus at 7 months

The skin of the embryo becomes light and human-like. The child increasingly opens his eyes, trying to explore the surrounding space. Its weight reaches 1 kilogram, and the height is about 37 centimeters.

If the child is developing normally all the time, without having pathologies and serious deviations, he can continue his development even outside the womb. There are many cases where it was possible to make 7-month newborns.

Fetus at 8 months of pregnancy

The embryo actively accumulates subcutaneous fat, which is useful for him to exist in the outside world. The kidneys work well and bring more than 2 cups of urine per day into the amniotic fluid.

Future mothers already understand what their child is doing. After a lull, you can guess that the baby is sleeping, and by active jolts you can understand his dissatisfaction or just a happy state.

9 month: how does a child look and develop?

At 9 months of pregnancy, the embryo finishes its formation. He only gains weight, gets more hair on the head and body. Improves the musculoskeletal system. But at the same time, the bones on the skull remain soft and supple. All this is necessary so that the child is born and passed without problems through the birth canal.


Embryo development can be traced from 1 to 40 weeks of pregnancy. Each stage marks a new leap in growth, weight, and the laying of vital organs. If development occurs taking into account all the features and characteristics, then a full-fledged baby appears on the light in time, without serious pathologies and deviations.

Watch the video: Amazing Animation of a Fetus Growing in the Womb (October 2019).

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