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3 doctors weighed in: When during pregnancy should you stop laying on your back? 3 doctors weighed in Want a second opinion? At approximately 24 weeks you should avoid laying on your back for prolonged periods of time in order to avoid compression of veins (vena cava). In brief: 6 months.
When you lie on your back, the weight of the pregnant uterus slows the return of blood to your heart, which reduces blood flow to the fetus. That means the baby is getting less oxygen and fewer nutrients.