Rolling over, that is. Today, Katie went to yoga, and I stayed at home with Penelope. When Katie left, Penelope was enjoying being on her back on the play mat. Since she hadn't had any tummy time today, I flipped her over onto her belly and put her arms under her chest. She started looking around, and I went to put something away. When I came back, she was on her back! Since there was no one else to help her roll, it was clear that she did it herself. So, I put her back onto her chest to see if she could do it again. This time I watched her closely.