It's normal for a young child to be noisy, and it's normal for a young frustrated child to yell when he's upset.
It's his age but it could be exacerbated or intensified by his environment. Two year olds are also delightful, and they don't have to be frustrated all the time.
When they ARE frustrated, responding optimally (showing understanding & acceptance for their feelings) helps them to get through them, so upset/yelling isn't a prolonged state.
at 1:57 PM on Jun. 26, 2013