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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.
Best Sleep Positions. What's the safest sleep position during pregnancy? After your fifth month, your back is definitely not best. Sleeping on your back puts extra pressure on your aorta and inferior vena cava, the blood vessels that run behind your abdomen and carry blood back to your heart from your legs and feet. Pressure on these vessels can slow blood circulation to your body -- and your baby. Not back or stomach.