My ds3 is 13nths old and over the xmas break he has turned into a nightmare. Before he was the happiest most contented baby who would smile at anyone and sit quietly playing on the floor. Now he keeps crying all the time and screeching at the top of his voice, it takes ages to make him smile and most distubingly of all he keeps throwing himself on the floor and banging his head on purpose. He will even sit banging his head on the doors or window. He has been teething but he's not normally like that then and i don't remember my other two being like this. Has anyone else expeienced the same thing ??