Sam's not far off 4 months old... 3 months old if you want to stick to his corrected age. He's extremely bright and alert and absolutely loves to just sit and look at things. He's just discovering that he can hold things and putting them in his mouth is lots of fun. He's becoming much more vocal and is rapidly increasing the sounds he can make and is repeatings sounds back at us when we mimic them. I guess you could say he's doing all the normal things for his age...

But he doesn't roll yet.

He did it once when he was 9 weeks old - managed to roll from his back to his tummy and never again since. He doesn't even seem to try. Should I be worried? Is there much I can do to help him?

BW