Matthew just started rolling over today! He has never been a huge fan of tummy time, so we don't torture him too often with that. I was a bit worried that he hadn't learned to roll over yet and that we weren't helping the cause, but he figured it out from his back to his tummy and is able to get back to his back some of the time. We will likely be putting the bumper in the crib now because he is hitting his head on the wood slats as he moves all around. We love our little boy!