Since ds2 (7mo) started sitting up a few weeks ago, ds1 (21mo) has started pushing him over, quite deliberately, causing much distress in the midnight house. DS1 is pretty advanced linguistically, so understands that he's not supposed to do it I think (he started disguising his pushing with 'cuddles' when he thinks we're looking). I imagine mine and dp's tone of voice would probably let him know that if he was in any doubt.
It's our first taste of terrible twos and we're not too sure how to handle it. Obviously, we try to cushion ds2's immediate area anyway, but we'd like to stop the behaviour if we can. Does anyone have any success stories with this kind of thing, or do we just have to resign ourselves to keeping them apart when we're not right next to them?