I think this one is partly my fault. We've started using timeouts when difficult child 2 hits, pushes, ect... (This aggression is new for him.) And while I was cleaning their room (difficult child 2 and easy child share) he kicked easy child. Normally timeout is on the piano bench downstairs, but I thought that sticking him in the crib would be a good time out spot. He can't get out easily and no toys. I stuck him in the crib. Timeout ended and he kicked easy child again. Back in the crib, timeout ended. He asked to go into the crib, and I said no. He then goes over to easy child, kicks him, and stands in front of the crib. He got time out in the cornor. Since then we've had problems keeping him out of the crib. I'll wake to easy child crying in the night and find that difficult child 2 has gotten in the crib and squashed him against the rails.
The good things happening are that difficult child 2 has begun to echo whole sentances. This is preferrable to the silence that was just a few months ago. The articulation isn't great (I think I'm the only one who can understand him) but it's improvement.