I would be lying if I said I wasn't worried, but Ashlyn is 15 months old now and she cannot roll from her back to her belly. I find this kind of strange. We have been working with her quite a bit, we will lay her on her back and guide her arms and legs, but to no avail. We will try rolling her to her left side and also to her right side, but it makes no difference. If Ashlyn is on her back, she will stay on her back until someone comes to her aid. She is our little turtle.