When a small seed is quietly planted, happiness blossoms like a flower in your body. How wonderful it is to have a new life. Congratulations on becoming an expectant mother. Looking at their slightly bulging belly in the early pregnancy, is it also very interesting to know the growth changes of the fetus during these 12 weeks?
- Growth and Development of the First Month Fetus
Fertilized egg gradually grows up by periodic cell division and implants in the third week. At this time, genes have determined the sex, skin color, height and appearance of the fetus. During this period, the fetus gradually establishes the nervous system, blood system and circulatory system.
The weight of the fetus is about 1g and the length is about 0.4-0.7cm. It can be seen that the hands and feet have begun to form, but the head and trunk cannot be clearly distinguished.
- Growth and Development of the Second Month Fetus
In the 8th week, the weight of the fetus increased to 4g, and the length of the fetus also increased to 2-3cm. At this time, the fetus gradually forms a human shape, and the head, trunk, hands and feet are gradually separated. From the beginning of the head, the heart, liver, stomach and other internal organs of the prototype also gradually formed. The chorion is more developed, the placenta is formed and the umbilical cord appears. The relationship between the mother and the fetus is very close.
Note: during the period of 4-8 weeks, the three germ layers developed into some specific tissues and organs respectively, and the main organ system has been basically established in this period.
- Growth and Development of the Third Month Fetus
By the 12th week, the fetus has completely changed from embryo to “fetus”. At this time, the body length is about 7.5-9cm, and the weight is about 20g. The tail disappears completely, the shape of facial organs is clear, and the hands, feet and fingers are also clear at a glance.
The internal organs continue to develop, the kidneys and vulva have grown, and the urethra begins to form and excrete. The fetus is surrounded by amniotic fluid.
