V.P.
My son always did -- MY hair. He'd pull on my hair, wrap it around his hand until it was wound up to my scalp and pulling painfully, he'd put it in his mouth and he'd gather it like a paint brush and stick it in his ear. He'll be 9 in a couple of weeks and every once in a while, if we are cuddling, I catch him rubbing my hair between his fingers, even now.