Low placenta in the 4th month of pregnancy may be caused by the low location of the fertilized egg’s implantation, prolonged standing, and poor blood circulation in the uterine lining, which can be handled by resting, fertility preservation and termination of pregnancy. 1. Low implantation position of the fertilized egg: due to the low implantation position, the placenta may be low. At this time, you should pay attention to rest, avoid participating in heavy physical activities, avoid bending, squatting and other actions; if vaginal bleeding occurs, you can also follow the doctor’s advice to use fertility preservation drugs, such as progesterone and other treatments. 2. Standing for a long time: If you stand for a long time during pregnancy, it may affect the position of the placenta, and some pregnant women may have a low placenta in the fourth month of pregnancy. At this time, pregnant women should pay attention to rest, avoid standing for a long time, can improve the situation of low placenta to a certain extent. 3. Poor endometrial blood circulation: Some pregnant women may have low placenta in 4th trimester due to poor endometrial blood circulation caused by damage to the endometrium, such as multiple cesarean sections. If vaginal bleeding occurs during pregnancy, the use of progesterone and other fertility preservation treatments can be prescribed by the doctor; if the life of the pregnant woman is jeopardized, the pregnancy should be terminated in time. If there is a low placenta in the fourth month of pregnancy, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor, improve the relevant examination, clarify the cause of the disease, and symptomatic treatment.