I'm not one to brag about my precocious offspring, usually. But I just changed Edgar's diaper on a blanket on the floor, flipped her over onto her tummy for a minute, to give her tummy time, and went in the kitchen to toss the diaper. She started fussing as I was washing my hands, and I dried them and came back in to find her on her back. Yes, my 11 week old, 3 weeks adjusted, rolled from her belly to her back. I'm more shocked than anything else. I'm sure it's a fluke and she won't do it again for months, but Bob didn't do that til she was 3.5 months old, and then not again for several weeks. If anything, I'd expect Edgar to be delayed, because of her prematurity.