With the liberalization of the second child policy, it is easy to have a low placenta when the first child is born by cesarean section or has a scarred uterus, so it is important to do a good maternity check and give fetal preservation treatment. If the placenta is found to be hypoplastic after the third month of pregnancy, you can rest in bed, minimize activities, and give fetal preservation medication, such as progesterone, to see if it can grow upward with the fetal growth and development, and if it can leave the cervical opening, then you can continue the fetal preservation treatment, which usually will not affect the fetal growth and development in the later stage. If the placenta remains low in the second trimester, if there is no pre-eclampsia or fetal dysplasia, the fetus can be preserved as much as possible and an elective cesarean section can be performed in the 38th or 39th week of pregnancy. Most of the cases of placenta hypoplasia occur due to thin endometrium or scarring of the uterus, local malnutrition of the endometrium, and the placenta grows downward in order to absorb enough nutrients. If the placenta is hypoplastic, it is important to increase the number of maternity checkups, try to rest in bed, give fetal preservation treatment, and increase nutrition to ensure that the fetus has enough nutrients to promote growth and development.