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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.
Typically, babies start sitting at 6 months, but this should not be taken literal, but as a ballpark. So babies that sit near 5 months through 7 months, this is OK. If your baby is sitting early, I would also ask, is your baby rolling over because, with back to sleep, (which is a MUST!) and babies are not going on their belly as much, some babies HATE to be on their tummies and would prefer to sit.