My son is 18 months old for the past wee while he's been headbutting floors walls cabinets you name it he's also been hitting me nipping me biting me pulling my hair and then he headbutted me proper bad today he doesn't like being told no, he likes to touch things that he shouldn't ie cooker fire place plugs etc I've tried too reason with him and be firm he doesn't do this too anyone else other than myself he laughed today when he headbutted me and i was crying he's up 5 times a night aswell , he constantly has to be holding something whether that be his bottle, toy or whatever I'm at a loss does anyone know what this could be any advice is welcome right about now thanks