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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.
You should also stop using it by 3 or 4 months, before your baby is rolling over or, later, standing up (some babies figure out how to climb them and can topple out of the crib).