The low position of the placenta in the 4th month of pregnancy is prone to hemorrhage and miscarriage, which is more dangerous and needs to be taken seriously. The low position of the placenta in the 4th month of pregnancy indicates the existence of placenta praevia, and when the pregnant woman is active, vaginal bleeding is likely to occur, and when the bleeding is large and difficult to control, it will jeopardize the life of the fetus of the pregnant woman, as well as may cause preterm miscarriage, which is detrimental to the fetus. Therefore, adequate attention needs to be paid to the need for pregnant women to rest in bed to promote the normal growth of the fetus. Clinical when pregnant women in the fourth month of pregnancy found that the fetal position is low, you need to consult a doctor in a timely manner, under the guidance of the doctor to enhance the awareness of health care during pregnancy, if there is vaginal bleeding, lumbar pain, abdominal pain and other special circumstances, you need to deal with it in a timely manner.