my 14 month ds has just started to have tantrums when he cant get his own way, today he wanted a biscuit just as i was preparing his dinner, i told him no and he started to pinch my leg, i told him he was naughty and pointed my finger at him and he head butted me and bit me, tonight i was running his bath and because i wouldnt let him get in as i had only just started to put water in he head butted the bath, hes ok and i kept him awake for extra hour, how can i over come this head butting and biting, help