When does an infant turn from stomach to back?

Once your baby has head control and about the same time that he learns to sit on his own, he will learn to roll over. Your baby may be able to kick himself over, from his tummy to his back, as early as age 4 months. It may take him until he's about 5 or 6 months to flip from back to front, though, because he needs stronger neck and arm muscles for that maneuver.