The sleeping position of pregnant women can be divided into several stages: first, in early pregnancy, pregnant women sleep mainly to the standard of comfort, when the fetus is still mainly the development stage, the fetus is relatively small, you can choose to lie on your back or side, but can not choose to sleep on your back. Second, in the middle of pregnancy, it is best to choose the left side of the posture, because in the middle of pregnancy, the abdomen has begun to have a slight bulge, in order to protect the development of the fetus, you can choose the side lying posture, to prevent edema in the legs of pregnant women, but also to prevent the emergence of varicose veins in the lower limbs and the emergence of hemorrhoids. Third, the basic condition of the fetus has been stabilized in late pregnancy, the fetus is larger, the ligaments will also become looser, it is best to choose the left side lying position.