Placenta hypoplasia refers to the small size of the uterine cavity in early pregnancy, which makes it easy for the placenta to attach to the lower part of the uterus of pregnant women. However, with the passage of time during pregnancy, usually the placenta will gradually move upward, so the medical science to women 28 weeks of pregnancy as the boundary, if the placenta before 28 weeks of low position, known as placenta hypoplasia, after 28 weeks of low position of the placenta is known as placenta praevia. 1, 28 weeks of placenta hypoplasia: if it is found in the early stages of pregnancy, placenta hypoplasia can be observed, do not have to worry too much, because with the increase of pregnancy, most of the placenta will gradually move upward, and the state of placental hypoplasia will disappear. As the pregnancy increases, most of the placenta will gradually move upward, and the low state of the placenta will disappear immediately. Pregnant women need to pay attention to rest, limit the number of times of sexual intercourse, reduce activities, and when sleeping, it is recommended to adjust the sleeping position and elevate the buttocks, which is conducive to the upward movement of the placenta. If placenta previa is found in the middle of pregnancy, without bleeding, abdominal pain symptoms, it is recommended to increase the bed rest time, reduce the amount of exercise, prohibit sexual life. If bleeding and abdominal pain occur, it is recommended to be admitted to the hospital immediately for observation; 2. 28 weeks after the placenta hypoplasia has not changed: at this time, the placenta is located in the lower part of the uterus, and the lower edge of the placenta may have covered the cervical os, or has been close to the os of the uterine cervix, and it is necessary for the pregnant woman to be admitted to the hospital as soon as possible, to maintain bed rest for a long period of time, to take the left position of the bed, and to maintain regular oxygen intake and continuous monitoring of the fetus. If the placenta is too low and accompanied by heavy vaginal bleeding, the pregnant woman should be admitted to the hospital as soon as possible for observation and treatment, and if the bleeding is recurrent, it is necessary to consider stopping the pregnancy.