Don't worry Lou, every baby is different and on a web site I was looking up, sitting independently normal range is 5 to 9 months - so plenty of time. My little girl (6 1/2 months) has just started to sit on her own, but she has no interest in rolling. She has rolled back to front and visa versa once and that was months ago. Se is happy to roll to her side, but has no interest in going all the way over. I think she figures she can see enough on her tummy and when she is sitting up smile