How many months of pregnancy is the baby fully developed?

The development of the fetus in the mother's womb is a very miraculous process. During these 10 months, the fetus develops diligently every day. They combine from a tiny sperm and egg to become a small embryo, then to a small test tube embryo, and finally grow into a baby weighing nearly 6-8 pounds. It is really hard not to sigh at the wonder and excellence of life.

At how many months of pregnancy will the baby have all four limbs?

The fetus within 10 weeks of pregnancy is called a test tube embryo, which is a critical stage for the division of the baby's main organs. The fetus's limbs also begin to appear at this stage; from the 11th week of pregnancy, the fetus enters the "test tube embryo period", and the internal organs, including the limbs, gradually develop and mature.

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

The fetus at this stage is just an insignificant "tiny embryo bud". During the 1-2 weeks of pregnancy, the baby will not exist. It is not until the 3-4 weeks of pregnancy that they will form sperm and egg fusion or the embryo will implant successfully.

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

The small test tube embryo (fetus) at this stage looks like a grape, is only 2-3cm long and weighs about 4 grams.

However, the organs of the embryos at this stage have already begun to have obvious characteristics, and each organ has begun to "grow rapidly": there are small amounts of webbed material between the fingers and toes (like the thin, soft webbed material connecting chicken feet and duck wings). Around 7 weeks of pregnancy, if the pregnant mother does a B-ultrasound, she can see the embryonic heart and the initial fetal heartbeat.

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

Entering the third month, the fetus has upgraded from a "test tube embryo" to a "fetus", their organs are dividing, and they are about to enter a stage of rapid growth and development.

Pregnancy Week 9:

The "little fetus" at this time can already distinguish between left and right and the body. The head accounts for half of the body, the structures of the eyes and ears are basically completed, and the nose is vaguely visible; the hands and feet are fully developed. If you take an ultrasound at this time, you can see the flexion and extension of the fetus's hands and feet.

Pregnancy Week 10:

Another week has passed, and the fetus has grown a lot. The wrists have taken shape, the ankles have begun to grow, the fingers and toes are clearly visible, the arms are longer, and the elbows are becoming more bent.

Pregnancy Week 11:

The fetus at this week of pregnancy can begin to suck, swallow and lift its legs, and the fetus's nails and hair have begun to appear, but the hair is still in the form of fuzz; the brain and organs have also begun to function; the fetus's bone cells grow faster, the body gradually lengthens, and the bones become thicker.

Pregnancy Week 12:

At this time, the fetus is already about 9 cm long, and its big head basically accounts for half of the entire body. This stage is the first stage of the rapid reproduction of the fetus's brain nerves.

In addition, the webbed substances on the fetus's hands and feet have also begun to gradually disappear. The fingers and toes can be completely separated. The joints and bones have been formed. The heels and knees of the fetus can be clearly seen under ultrasound. The bones will gradually become harder and harder, and the prototype of the joints will appear.

4. Fourth month of pregnancy (13-16 weeks)

The length of the fetus grows from 10cm to 16cm, and the weight increases from 38g to 110g. The fetus enters a rapid development stage. At this point, the fetus can already "wave" by itself, its fingers can clench with the palms, and its toes can move and bend with the soles of its feet.

At 14 weeks of pregnancy, the fetus' fingers will have unique fingerprints;

At 15 weeks of pregnancy, the long legs are longer than the arms, the fingernails are fully grown, and the joints between the fingers can move freely.

At 16 weeks of pregnancy, all the limbs of the fetus have developed, and even the reproductive organs have already formed, and the sex of the fetus can be identified by ultrasound.

The above is the entire process of fetal limb growth and development. In the fourth month of pregnancy, pregnant mothers can collect the actual growth and development status of the fetus at different weeks of pregnancy and compare them when they reach the corresponding weeks of pregnancy.