My 13 month old son has quite a habit of pulling other people's hair (as well as his own). He also likes to push other children, which understandably they aren't keen on. I know he's very young, but I really don't want him to get into bad habits or be the thuggish child at playgroup etc. Not sure how to handle it in an age appropriate way really. So far I've just been telling him sternly that 'we don't pull hair' and that 'we touch people gently', but I don't think he gets it. If he pulls my hair I put him down straight away and let him cry for a minute. No idea what else to do really. Any ideas?