I have the same thing - 3 one-year-olds, including my own, but in my case it's a little girl who's rough. In her case, though, it's definately learned behaviour. She has a 3-year-old sister who I also watch who is very rough with her, and the little one has obviously learned that to get what she wants she needs to push, kick, and grab. I redirect as much as I can, but I'm trying to focus on correcting the older one's behaviour, who at 3 and a half, should know better and can understand consequences. Does your dcb have an older sibling that could be showing him this behaviour?

The only other suggestion I have is to go out of your way to praise any good behaviour. I've been very firm with her, taking toys away from her and giving them back to the child she took it from, etc, and then whenever she does do something gentler she gets tons of praise for it. It seems to help a little bit, but I'm at a bit of a loss too - you can't exactly put a one-year-old in time out!