It is always said that pregnant women need October, so how many weeks will it take for the fetus to be born?

Pregnancy in October, the birth of the fetus is a magical process. How did the baby grow from a fertilized egg of 0.5 cm to a baby of 50 cm? This is of great interest to many parents.

How does the baby "transform" a little bit? Next, let's learn about the "metamorphosis process" of the fetus month by month.

First month: eggs and sperm meet to form fertilized eggs. The first day of pregnancy is the first day of the last menstruation, not the day when the fertilized egg is formed.

Therefore, about 2 weeks after pregnancy, women ovulate. At this time, if the husband and wife are in the same room, everything goes well. Sperm and egg meet to form fertilized eggs, then enter the uterus along the fallopian tube, drill into the endometrium and start cell division. 1 becomes 2, 2 becomes 4 and 4 becomes 8. ...

In the third week of pregnancy, the fertilized egg becomes a "blastocyst" containing hundreds of rapidly multiplying cells. These cells will develop into fetuses and begin to produce HCG. At this time, pregnancy can be found by blood test, which is the earliest time to find pregnancy.

In the fourth week of pregnancy, the blastocyst officially became an "embryo", only the size of a poppy seed. Embryo consists of germ layer and epidermis, and in the next six weeks, all organs of the fetus develop from epidermis.

The second month: the embryo is rapidly differentiated and pregnant for 5 weeks. The embryo, the size of sesame, is developing rapidly at an alarming rate. At this stage, the embryo consists of three layers: ectoderm, mesoderm and endoderm, and then all organs will form.

In the sixth week of pregnancy, the embryo is the size of lentils, the baby's mouth, nose and ears begin to form, and the brain and intestines begin to develop.

After 7 weeks of pregnancy, the embryo is the size of blueberry and looks like a small hippocampus. After a week of development, the embryo has doubled in size and the tail has not disappeared. Small hands and feet look like pulp, emerging from developing arms and legs. If you have a B-ultrasound during pregnancy, you can see the fetal heart.

At the eighth week of pregnancy, the embryo is as big as kidney bean, and its limbs begin to move, with human appearance, and nerve cells form primitive pathways.

The third month: the basic development is basically completed. After 9 weeks of pregnancy, the fetus is as big as a grape, the physiological situation has basically developed, the small tail of the embryo disappears, and then it will gain weight quickly.

Pregnancy 10 week, the fetus is as big as kumquat, the baby has completed the most critical part of development, the skin is still translucent, the limbs will bend and begin to form nails.

Pregnancy 1 1 week, the fetus is as big as a strawberry and has basically taken shape. Although the pregnant mother can't feel the fetal movement, the baby can kick and stretch.

Pregnancy 12 weeks, the fetus is as big as a fig this week, the baby's reflex begins to develop, the fingers can be opened and closed quickly, the toes will curl up and the mouth will suck. This week, he will have his first formal birth check-up.

The fourth month: I am a baby with personal appearance. I am pregnant 13 weeks. The fetus is the size of pea pods, and the little finger has fingerprints. I can see the baby's organs and veins clearly through the skin.

Pregnancy 14 weeks, the fetus is as big as lemon, the brain impulse begins to stimulate, and the kidneys begin to work. Under B-ultrasound, you can see the baby sucking its fingers.

Pregnancy 15 weeks, the fetus is as big as an apple, and the baby's eyelids are still closed, but you can feel the light. If you shine a flashlight on your stomach, the baby will leave the beam.

At 16 weeks, the fetus is as big as avocado, and the pattern on the scalp begins to form, but there is no hair yet, and the legs are more developed. Sensitive pregnant mothers may gradually feel fetal movement.

The fifth month: the fetal movement is enhanced and the world begins to be perceived. The fetus is as big as a radish, the cartilage of the body gradually hardens into bones, the joints can move, and the umbilical cord is getting stronger and stronger.

Pregnancy 18 weeks, the fetus is the size of a sweet pepper, which will bend its arms and legs and gradually increase its activity. Pregnant mothers can already feel the fetal movement.

Pregnancy 19 weeks, the fetus is as big as a tomato, the sensory system (smell, vision, touch, taste and hearing) is developing, and the fetus can hear sounds. From then on, you can talk, sing, read stories and so on. Do prenatal education with the fetus.

After 20 weeks of pregnancy, the fetus is as big as avocado and can be swallowed, and meconium will be produced in the digestive system.

The sixth month: The fetus develops difficultly and begins to remember the mother's voice. Pregnancy 2 1 week. The fetus is the size of a carrot, and its activity gradually increases, from the initial flapping to kicking. Even pregnant mothers who feel fetal movement late can feel fetal movement this week.

At 22 weeks of pregnancy, the fetus looks like a miniature newborn, and the lips and eyebrows gradually become obvious.

After 23 weeks of pregnancy, the fetus' auditory development is more sensitive and the ears can pick up sounds better. For example, if you hear your mother's voice every day, you will remember her voice after birth.

At the 24th week of pregnancy, the fetus is as big as a big mango, and its size has been reduced to a slender figure, and its skin is still thin and translucent.

The seventh month: the happy little fetus with rapid weight growth is pregnant for 25 weeks. The fetus is about 27 cm long and weighs about 850 grams. The subcutaneous fat began to grow, which looked more like a newborn, and the hair began to appear, with obvious color and texture.

After 26 weeks of pregnancy, the fetus is about 28cm long and weighs about 1000 g. It will inhale and spit out amniotic fluid, which is beneficial to the development of the lungs.

At the 27th week of pregnancy, the fetus is about 30cm long and weighs about 1 100g. The brain is already very active, and it will sleep and wake up regularly, and the lungs have not yet fully formed.

At 28 weeks of pregnancy, the fetus is about 33cm long and weighs about 1200 g. Her eyesight is developing, she can feel the light from the outside, she has grown eyelashes and can blink.

Eighth month: start preparing for childbirth. I am 29 weeks pregnant. The fetus is about 37 cm long and weighs about 65,438 0,300 grams. Muscles and lungs continue to develop, and the head becomes bigger and bigger, which prepares enough space for brain development.

At 30 weeks of pregnancy, the fetus is about 39cm long and weighs 1500 g. Vision continues to develop, and fuzzy shapes can be seen in the dark.

Pregnancy is 3 1 week. The fetus is about 4 1cm in length and weighs about1700g. It can turn left and right, and there is more and more subcutaneous fat.

At 32 weeks of pregnancy, the fetus is about 42 cm long and weighs about 2000 grams. The toenails, nails and hair of the fetus have all grown out.

Ninth month: the fetal head is lowered and the fetal position is fixed. Be prepared when you are 33 weeks pregnant. The fetus is about 44cm long and weighs about 2200 grams. The digestive system and respiratory system of the fetus are close to maturity, except that the skull is still soft (ready for delivery), the bones in other parts have gradually hardened, and the subcutaneous tissue is also full of fat.

At 34 weeks of pregnancy, the fetus is about 45 cm long and weighs about 2500 grams. The fetal head has been washed down and is ready to be put into the basin. The central nervous system and lungs gradually mature.

At 35 weeks of pregnancy, the fetus is about 46 cm long and weighs about 2700 grams. The kidneys have developed and the liver has begun to work. At this time, the activity of the fetus has changed from "kicking" to "swinging and rolling".

After 36 weeks of pregnancy, the fetus is about 47cm long and weighs about 2750 grams. The fetal position has been basically fixed, and the first step is to prepare for delivery. Fetal fat and fetal hair gradually fall off.

Tenth month: I'm going to be born and see my mother! At 37 weeks of pregnancy, the fetus is about 48 cm long and weighs 2800 grams. It already looks like a newborn, and it is ready to be born. In the next two weeks, the lungs and brain will be fully developed.

At 38 weeks of pregnancy, the fetus is about 48 cm long and weighs 3000 grams. All the organs of the body have matured and started to work.

After 39 weeks of pregnancy, the fetus is about 49 cm long and weighs about 3200 grams. The baby will get a lot of antibodies from the placenta and store them in the body to prepare for postpartum protection.

After 40 weeks of pregnancy, the fetus is about 50 cm long and weighs about 3500 grams. At this time, it has reached the expected date of delivery, and pregnant mothers will secrete hormones to stimulate delivery.

The above is the development process of the fetus at 40 weeks of pregnancy, from a small fertilized egg to a lovely baby. Isn't it cute and amazing? What unforgettable experiences did you have during pregnancy? Let's leave a message.