At what age do babies start holding toys and roll over? He's intereste…

At what age do babies start holding toys and roll over? He's interested in toys, reaches out with his hands to touch them, but he still can't hold them himself. As for rolling over. I read that many children of our age and even younger ones can already roll over on their stomachs ? while my little one hasn't even tried to roll over from his belly. It was only a couple of times when he tried to roll over from his stomach, but they didn't really come out.