My 5mo rubs his feet together whenever he seems frustrated. he will rub his right foot down the side of his left foot until his big toe on the right foot bends out and then flicks back. he also does it the other way around. This is starting to cause dry spots of skin, but I'm more concerned about the affect it is having on his big toes...they are literally bent until they are at right angles to their normal position. Does anyone have any experience of what might be causing this? should I be worried? he doesn't seem in pain at all.