Not too long ago, pediatricians and other health care providers used to think that babies should sleep on their stomachs. However, research now shows that healthy babies are less likely to die of SIDS when they sleep on their backs. Therefore, placing your baby on his or her back to sleep is the number one way to reduce the risk of Sudden Infant Death Syndrome (SIDS).
Every sleep time counts, so do not make exceptions to this rule for short naps, and make sure all caregivers place your baby to sleep in the same position. Studies show that babies who are used to sleeping on their backs, but who are occasionally then placed on their stomachs or sides to sleep, are at significantly higher risk for SIDS. This risk is actually greater (sometimes seven to eight times greater) than that of infants who are always placed on their stomachs or sides to sleep.
Therefore, make sure that everyone putting your baby to sleep (grandparents, babysitters, nanny, daycare team, friends…), knows about the best positioning and they all place your baby in the same position.
Once a baby has the ability to roll over the neck muscles are stronger and the chance of SIDS decreases. When infants roll over on their own, there is no evidence showing that they need to be repositioned and back to their backs.