Pregnant women in the third month of pregnancy can sleep on their stomachs, but try not to sleep on their stomachs. The first 3 months of pregnancy, the fetus is relatively small, the uterus is not out of the pelvic cavity, this stage of pregnant women sleep on their stomach for a short time, generally will not have too much damage, but after 3 months of pregnancy, the uterus has increased significantly, do not exclude the uterus may have been out of the pelvic cavity, if sleeping on your stomach will cause compression of the abdomen, the uterus will also be compressed, affecting the activities and development of the fetus. With the development of the fetus, the uterus will become larger and larger, it is recommended that pregnant women sleep in the left lateral position, which can increase the space for the fetus to move in the abdominal cavity, but also to counteract the compression of the uterus on the right side of the blood vessels, so that the blood in the uterus is smooth and conducive to the growth and development of the fetus, as well as in late pregnancy will avoid gestational hypertension. If a pregnant woman takes a left-sided position and rests for too long, thus feeling too tired, she can also occasionally take a moment of rest in the right-sided position. Pregnant women pay attention to the combination of work and rest, do not sit still for a long time, and should not be overworked.