The basic cell structure of the fetus has been formed at 10 weeks of pregnancy, and the ultrasound examination can reveal the amniotic fluid, placenta, and fetal heartbeat. At this time, all organs of the fetus are basically formed, and the head of the fetus accounts for about half of the body length. At this time, all organs are in the developmental stage and are not fully developed. The rest of the body, including the arms, legs, eyes, genitalia, and other organs, are developed and clearly visible. All parts of the body are beginning to take shape, with a length of about 4 cm and a weight of about 13 g. The ultrasound shows that the fetus is active in the amniotic fluid, the fetal sac is beginning to disappear, and the placenta in the shape of a moon bud is basically visible. The fetus will increase relatively quickly in the next 3 weeks and will be close to 10cm in length. At this time, pregnant mothers should pay attention to strengthen the calcium and vitamin D supplement. It is important to drink more boiled water, eat more fruits and consume vegetable juices to promote food peristalsis in the digestive tract, which is beneficial for pregnancy. Drink more milk to supplement calcium and increase sodium excretion in urine, which can effectively reduce blood volume and eliminate edema, which is beneficial to the development of fetal bones. At this time, the fetal skin is transparent and the forming liver, ribs and other body organs, such as subcutaneous blood vessels, heart, liver, stomach and intestines, can be clearly seen through the skin.