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No. Rolling over is an important and natural part of your baby's growth. Most babies start rolling over on their own around 4 to 6 months of age. If your baby rolls over on his or her own during sleep, you do not need to turn the baby over onto his or her back. The important thing is that your baby starts every sleep time on his or her back to reduce the risk of SIDS, and that there is no soft, loose bedding in the baby's sleep area.
Your baby's first step toward mobility isn't actually a step at all -- it's a roll. When she's about 2 or 3 months old, she may flip from front to back. During tummy time (which you should supervise), your baby may lift herself into a push-up position and then start to rock back and forth or kick her feet. Then, if she's strong enough, those movements will send her rolling over.