Focus of Baby Development at 40 Weeks of Pregnancy

Congratulations, you are pregnant! Do you really want to know how old the baby is? What does the baby look like in your belly? Do you feel fetal movement in what? Then let’s spy on the growth process of the baby in the mother’s belly.


The process of sperm meeting egg and merging into one is called [fertilization], which we also call [conception]. At this time, the genetic composition of the fetus (including sex, etc.) has been determined.

Three days after fertilization, the fertilized egg rapidly divides into multiple cell clusters. It passes through the fallopian tube into the uterine cavity and implants in the endometrium. At this time, the placenta, which provides nutrition to the fetus, also begins to form.

4 Weekends

The face and neck of the fetus are at the stage of growth and development, the cardiovascular system is also growing further, while the lungs, stomach and liver are just beginning to develop. At this time, pregnant women can get positive results if they carry out early pregnancy tests at home.

8 Weekend

It can be distinguished that the baby’s eyes, ears, nose, arms and legs have been completely formed, while the fingers and toes are more slender and distinct. B-ultrasound can hear the baby’s heart beating.

Why do you need to check so many B-ultrasound during pregnancy? Please click: Pregnancy and Birth: Early Pregnancy B-ultrasound Is Important

12 Weekend

The baby is currently about 9cm long and has movable limbs. You may begin to feel that your uterus is larger than the pubic plane. Doctors can use special instruments to detect the fetal heart.

16 Weekend

The baby is currently about 16 centimeters long and weighs about 100 grams. The bottom of the uterus is about 8 centimeters below the navel. The baby can blink, the heart and blood vessels are completely formed, and fingerprints have been formed.

20 Weekend

The baby currently weighs about 320 grams and is 25 centimeters long. The bottom of the uterus is about the level of the navel. The baby can suck his thumb, yawn, stretch or make faces. If you have not been kicked in the stomach by the baby before then, you will soon feel the [first fetal movement]!

It’s time for ultrasound examination!

Usually at 20 weeks, all pregnant women have an ultrasound examination. The doctor will use this examination to determine whether the placenta is in good position and function and whether the fetus is developing normally. Through B-ultrasound, you can see the fetus’s heartbeat and the movement of body and limbs.

What are the specific ultrasound tests for 20 ~ 24 weeks of pregnancy? Please click: The Things of Pregnancy and Birth: B-ultrasound [Large Deformity Screening]

24 Weekend

The baby currently weighs about 635 grams. If he hiccups, you may have obvious feelings. As the fetus’s inner ear develops, the fetus can feel itself upside down in the uterus.

28 Weekend

The baby currently weighs about 1,000 grams and its fetal position changes frequently. If the fetus is born prematurely, it also has a chance to survive, but is prone to respiratory distress syndrome.

If the baby is born prematurely, how can it better help the baby grow up healthily? Please click: how Helps Premature Babies Grow Healthy

32 Weekend

At present, the baby weighs about 1800 grams and has frequent fetal movements. The skin of the fetus shrinks and begins to form a small amount of subcutaneous fat. At this time, the doctor will tell you how to count fetal movements.

You can start thinking about breastfeeding. At this time, there may be some yellowish liquid overflowing from the breast, which is colostrum.

It’s time to understand that what is the right breast-feeding posture! Please click: a picture to read the correct breast-feeding posture.

36 Weekend

The size of the baby depends on many factors, such as sex, number of fetuses, height and body shape of parents, etc. Therefore, we should not only pay attention to the size of the baby, but also pay attention to the growth rate of the baby.

On average, the fetus is about 45cm long and weighs nearly 2500 grams. The brain develops rapidly, the lungs are almost fully mature, and the head is usually in the basin.

If the gestational age of the fetus is greater than or equal to 37 weeks and less than 42 weeks, it is called “term infant”.

The baby is born!

The expected date of delivery is calculated by the mother’s last menstruation, The duration of pregnancy is generally 40 weeks. Some pregnant women are pregnant for more than 42 weeks, which we call [overdue pregnancy]. Of course, it is not necessarily true overdue, because there are certain errors in the estimated expected date of delivery. However, due to the consideration of the safety of both adults and children, most fetuses are born 42 weeks ago, and sometimes induction of labor may be required to terminate pregnancy in due course.

How is the expected date of delivery calculated? In fact, it is not complicated at all. Please click: Weekly Record of Pregnancy (9): How is the expected date of delivery calculated?

Responsible Editor: Huang Lijia