Over the last week my DS has started to bang his head against the nearest thing (eg chair, wall, door, my leg) when he doesn't get what he wants. At first I ignored it and just tried to divert his attention hoping that as he didn't get a reaction he'd stop doing it, but that hasn't worked as he is still doing it. Today I said to him "don't hurt your head" and rubbed it better, but he is still doing it.
Should I be worried and what can I do to stop him?
Also he will try to hit my face or pull my glasses off if I am holding him and say "no" to him.
I am worried incase he is showing signs of behavioural problems.