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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.
Head and trunk control ( infant lifts head, watches a moving object by moving the head from side to side - occurs in the first few months after birth. Infant rolls over turning from the stomach to the back first, then from back to stomach - four or five months of age. Sit upright in a high chair (requires development of strength in the back and neck muscles)-four to six months of age. Infant gradually is able to pull self into sitting positions.