At exactly 4 months and two weeks old. Brandon rolled over (relive the magic here).
Yesterday, at exactly 3 months and two weeks old, in the exact spot Brandon first did, Holden rolled over.
Also some bragging here: he first rolled from back to stomach which, according to babycenter, means he is an extremely strong and buff little beefcake. He knows it, too from that little smirk he gives afterward.
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.