My 3 year old little boy is fun, loving and cheery most of the time. He has a little brother of 8 months and he had some behavioual issues when he arrived which were expected. He seems to have accepted him now but his behaviour is awful whenever he is with other children of his age (at our house or theirs). Its like he is in competition. He becomes mean, spoilt and very very hyper! Has anyone else experienced this and if so how should I deal with it? He has even been aggresive to my friends baby who is the same age as my youngest. Thanks!