Thanks so much for all your feedback. I have mentioned it to my sons doctor and the plunket nurse and neither of them have ever come across this before which made me worry even more. He only does it when hes bored or tired and its not everyday and he has never done it outside our home because he's always so active when we are out. Its a mystery but its nice to know he may outgrow it and he's not the only one, so thanks alot. Cheers Missy