You just can't leave them alone together....doesn't it sound horrible? Ick.....but it's true, he probably doesn't understand why he is doing it just yet. I think at that stage it was all about prevention at my house. I never felt punishment worked either....it was really hard wondering what to do next or that I wasn't doing enough

It should improve though....but over time, when B gets older you can start giving him other tools.

hth