My 18 mo DS has always loved grabbing/pullin/biting and suckingmy hair. He'll go for my hair almost every time he gets close enough. I thought he would grow out of it, but he's showing no signs. It is a bit annoying but what I don't mind if it gives him comfort. What does worry me is that he actually gets peices of my hair in his mouth and although I/him manage to pull them out, he must be 'eating'some of it.
Does anyone else's DS/DD do this? Did they stop. Is it totally silly to worry about DS emassing some big hairball inside him? - yes probably - but you do hear of such things in the news once in a blue moon.