A baby within 1 weeks of pregnancy is called an embryo, which is an important period for the differentiation of the baby's main organs, and the limbs of the baby also begin to appear at this stage; From the 11th week of pregnancy, the baby enters the "embryonic stage", and various organs gradually mature, including limbs.

1. First month of pregnancy (1-4 weeks)

At this stage, the baby is just an unremarkable "little germ". At 1-2 weeks of pregnancy, the baby does not exist, and it is not until 3-4 weeks of pregnancy that they are conceived to form a fertilized egg or the fertilized egg is successfully implanted.

2. At the end of the second month of pregnancy (5-8 weeks)

The small embryo (fetal baby) at this stage looks like a grape, only 2-3cm long and weighing about 4 grams.

But in this period, the organs of small embryos have begun to have obvious characteristics, and each organ has begun to "develop busily": there seems to be a small amount of webbed objects between fingers and toes (just like the thin layer of soft webbed objects connected between chicken feet and duck feet). In the seventh week of pregnancy, if the expectant mother goes for a B-ultrasound, she can see embryo bud and the primitive fetal heart beat.

3. The third month of pregnancy (9-12 weeks)

In the third month, the baby has been upgraded from "embryo" to "fetus", and their organ differentiation has been completed, which is about to enter the stage of rapid development.

Ninth week of pregnancy:

At this time, the "little fetus" can already distinguish the head from the body, the head accounts for half of the body, the structures of eyes and ears are basically completed, and the nose is faintly visible; Hands and feet are developed and shaped. If you take an ultrasound at this time, you can see the stretching of the baby's hands and feet.

1th week of pregnancy:

After another week, how much has the baby developed? The wrist has been shaped, the ankle has begun to develop, the fingers and toes are clearly visible, the arm is longer, and the elbow of the arm becomes more curved.

11th week of pregnancy:

What can the baby do at this gestational age? Sucking, swallowing and kicking, and the baby's fingernails and hair have begun to appear, but the hair is still fluffy; The brain and body organs have also started to work; The development of fetal baby's skeletal cells is accelerated, the limbs are gradually lengthened, and the bones are becoming more and more tough.

12th week of pregnancy:

By this time, the baby's body length is about 9 cm, and the baby's big head accounts for almost half of the whole body. This stage is the first stage of the rapid proliferation of the baby's brain cells.

In addition, the webbed objects on the baby's small hands and feet are gradually disappearing, fingers and toes can be completely separated, and joints and bones are forming. Under ultrasound, the heels and knees of the baby can be clearly seen, and the bones will gradually become hard, and the rudiments of joints will appear.

4. The fourth month of pregnancy (13-16 weeks)

The baby's length has increased from 1cm to 16cm, and the weight has also increased from 38 g to 11 g. The fetus has entered a stage of rapid development. At this time, the baby can already "shake hands" by himself, and his fingers can be clenched with the palm of his hand, and his toes can move and bend with the soles of his feet.

At the 14th week of pregnancy, unique fingerprints appeared on the fingers of the baby.

At the 15th week of pregnancy, the legs are longer than the arms, the fingernails of the hands are fully developed, and the joints between the fingers can move freely.

At the 16th week of pregnancy, the baby's limbs are all developed, and even the reproductive organs have been formed, so the baby's sex can be identified by ultrasound.

The above is the whole process of the development of the baby's limbs. During the first four months of pregnancy, pregnant mothers can collect the specific development of the fetus at different gestational weeks, and compare and see it at the corresponding gestational weeks.