Fetal bud is the stage in the development of a fertilized egg when various organs are gradually taking shape. If the pregnant woman usually has a regular menstrual cycle, the relationship between fetal bud 16mm and pregnancy week can be estimated by the formula, fetal bud (cm) + 6.5 is the pregnancy week, so when the fetal bud is 16mm, 1.6 + 6.5 = 8.1, which is usually around 8 weeks of pregnancy. At this gestational week the fetus is relatively small, the fetal shape is set, but the placenta is not yet fully formed and the fetus is still in a relatively dangerous stage. Therefore, pregnant women should pay attention to rest, try to avoid staying up late, overwork, excessive stress, strenuous exercise, etc., and should not engage in sexual intercourse. Diet to strengthen the nutrition, can follow the doctor’s advice to supplement folic acid, at the same time, eat small meals, can eat more lean meat, eggs, milk, whole grain bread, fish and other foods rich in high quality protein and nutrition. Regularly undergo maternity checkups, if there are abnormalities such as lower abdominal pain and irregular vaginal bleeding, go to the hospital in time for checkups to avoid preeclampsia.