If the fetus is small during pregnancy, the first thing to do is to check the gestational week, which can be based on the time of early pregnancy reaction, fetal movement and the length of the fetal bud in the ultrasound at 11-14 weeks. If it does not match the gestational week calculated from the last menstruation, you can re-project it and see if the size of the fetus matches the gestational week according to the new gestational week. The fetus may be small due to poor appetite or vegetarian diet during pregnancy, so it is recommended to increase the intake of high quality protein, eat some maternal milk powder, and increase the amount of fish, eggs and lean meat for nutrient supplementation; 2. If the fetus is still small after nutrition, it may be due to placental and umbilical cord malfunction caused by pregnancy complications, such as gestational hypertension, gestational diabetes, etc., which should be treated accordingly to relieve the fetal growth restriction; 3, amniocentesis and screening malformation ultrasound: the small fetus may also be due to fetal chromosomal abnormalities leading to its own stunted development, so the pregnant woman should be further screened by systematic ultrasound or amniocentesis to exclude fetal neurological and vascular malformations or chromosomal diseases. The company’s main business is the development of a new product, which is a new product.