Pregnancy can sleep on its side, especially in the middle and late stages of pregnancy, it is recommended to lie on the left side, not recommended to lie flat. Early pregnancy is generally no special requirements, pregnant women can choose the right sleeping position with their personal situation. 1, early pregnancy: at this time the fetus is small, the pressure on the mother’s body is smaller, you can sleep on your side. If the supine position makes women comfortable, you can also choose, both will not be harmful to the fetus or the mother’s body. However, it should be noted that the prone position should be avoided as far as possible, so as not to exhale the pregnant woman herself, which in turn affects the fetus; 2, mid-pregnancy: at this time, if the pregnant woman has too much amniotic fluid, carrying a double or multiple fetus, try to take the side sleeping position to avoid the increased pressure of the uterus on the inferior vena cava. If a pregnant woman feels that her lower limbs are heavy and she needs to adopt a supine position, she can elevate her lower limbs appropriately to promote the venous return of the lower limbs and reduce the occurrence of lower limb edema; 3. Late pregnancy: lying on the left side in late pregnancy can correct the right rotation of the uterus, reduce the compression of the abdominal aorta and increase the blood supply and oxygen supply to the fetus. Supine position should be avoided as much as possible during this period to avoid compression of the inferior vena cava by the uterus, which reduces the amount of cardiac blood return and cardiac output, leading to symptoms of hypotension and lower limb edema.