Sarah rolled from back to tummy today! She made it look so effortless and casual, too, like I hadn't seen her struggling all week and getting stuck in the same spot. She woke up from a nap stuck on her tummy as well (I guess she's forgotten that she knows how to roll from tummy to back?). Her problem is that she will not relax and put her head down if she's on her tummy. She'll figure it out sooner or later, I suppose.