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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.
Nearly all babies can sit on their own by the time they are nine months old (NHS 2013, Sheridan 2008) . While you can prop your baby in a sitting position almost from day one, sitting independently doesn't begin until your baby has head control. Three months to four months.