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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.
How babies learn to roll over. At about 3 months, when placed on his stomach, your baby will lift his head and shoulders high, using his arms for support. This mini-pushup helps him strengthen the muscles he'll use to roll over. He'll amaze you (and himself!) the first time he flips over.