Roll Over, Roll Over

Doodles can roll from his front to his back. I've seen him do it a couple of times. Yet, he seems to have forgotten how to do it. Because now he rolls from his back to his front--obviously forgetting that he detests tummy time--and then gets stuck. I've been summoned into his room more times lately to roll him, in his crib, back to his back. The routine is this: he gets on his stomach and starts to cry; I roll him back; he smiles and then within seconds rolls right back to his stomach and starts to cry again; lather, rinse, repeat. I just hope I can teach him soon that if he doesn't like being on his stomach, he shouldn't get on his stomach.