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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.
And as your pregnancy progresses, you'll need to avoid lying flat on your back as well. In that position, the weight of your uterus presses on your spine, back muscles, and major blood vessels, which can decrease blood flow around your body and to your baby. In addition to circulation problems, back sleeping can cause: Muscle aches and pains, hemorrhoids, and swelling.