when i had my youngest son, my eldest son was 21mths. he loved him instantly and wanted to hug and kiss him constantly. i was cautious, as he didnt know the weight of his strenght. but what i did learn was dont push him away, and dont keep saying no. otherwise the second my back was turned he was on him.
the last thing you want is a jealous child on your hands, and that is what he will become if you push him away.
just be consistant in telling your son to 'be gentle' or 'softly'.
also just be careful in the way you muck around with him, because usually thats the way he will try to be with bubs
i hope that helps. smile
Amina, mum of 3 boys 06/03, 03/05, 06/08