DD2 is 2y 3m old. Today she started a lovely new habit!! I told her off for climbing on the back of the sofa and launching herself forwards - not a bad telling off - just don't do that!! Anyway she burst into tears and then threw herself onto floor and started banging her head! DD1 never did this and I am at a loss! Do I tell her not to bang her head or do I not say anything in the hope that this will pass?? Ideas please!!!!