As the fetus grows and develops, the body shape and physical condition of pregnant women will undergo great changes during pregnancy, causing a lot of discomfort to pregnant women. If pregnant women sleep, stand, sit, and walk incorrectly, it can easily cause physical fatigue and even damage the health of the fetus. After pregnancy, the uterus gradually enlarges. Before delivery, almost the entire abdomen is occupied by the uterus. If a pregnant woman sleeps in a supine position at this time, the enlarged uterus will compress the aorta behind the uterus, and the blood supply to the uterus will be significantly reduced, directly affecting the nutrition and development of the fetus; the enlarged uterus may also compress the inferior vena cava,