Bed rest to keep the fetus can lie flat, mainly to feel comfortable, and different periods to keep the fetus lying posture also has certain differences. In the early and mid-pregnancy, lying flat or lying on the left side or right side can be, and it is recommended to raise or pad the height of legs and feet appropriately. You can turn over or get out of bed under the doctor’s supervision. In late pregnancy, it is recommended to lie on the left side or right side, which is more conducive to the good growth and development of the fetus in the uterus. This is because supine hypotension syndrome may occur if you lie flat for a long period of time. But pay attention to one point, no matter when, try to avoid lying on the bed to rest, long-term lying on the bed to rest will compress the uterus, affecting the normal development of the fetus.