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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.
A baby needs to develop muscle strength to be able to roll over, first from tummy to back, then vice versa. Babies may be able to roll over from tummy to back as early as 3 months and should be able to do so by 6 or 7 months. While lying on his or her tummy, you may first notice at about 3 or 4 months your baby lifting his or her head up.