My 4 year old started school a month ago. He has became friends with a group of boys that I would rather he wasn't friends with. Some people may think I'm being snobby but these boys have already been in trouble several times in the first few weeks for punching, kicking & general trouble making. I really feel they are a very bad influence as he is very naive &easily lead. He has already started becoming cheekier in just the few weeks that they've been friends. How do I encourage him to make other friends and keep his distance from those ones? He's only 4 so I need a way which doesn't involve him shouting across the playground 'My mummy says I'm not allowed to play with u'!'