For women in the early and middle stages of pregnancy, because the fetus is relatively small, its sleeping position has little impact on the fetus, you can take any sleeping position to sleep, if the left side of the sleeping pregnant women appear uncomfortable symptoms, you can use the right side of the lying position, or lying flat position to sleep and rest. For women in late pregnancy, because the fetus is relatively large, the majority of pregnant women are right-sided uterus, need to try to sleep on the left side to increase the supply of nutrients and oxygen to the fetus. If a woman has uncomfortable symptoms sleeping in the left side, she can consider sleeping on both sides alternately to relieve the discomfort. If necessary, you can inhale oxygen for half an hour every day to ensure the fetus’ oxygen supply and avoid fetal hypoxia, to move appropriately, to avoid crowded and noisy places, and to count fetal movements.