Just Rolling Around

Baby B rolled over from his back to his belly today. I thought this might be early for a baby, and Baby A has shown no interest in rolling over (he has managed to learn that he can get me to do just about anything, including sashay). It turns out the timing is about right for a baby to roll from belly to back, but from back to belly doesn't usually happen until 5 or 6 months. I don't know if this is true, but I'll just take it as gospel and say my baby is ready to go. He'll be walking by 5 months -- for better and worse.