I saw this earlier and since they didn't study kids who are younger I have questions. I wonder if it's overall how kids today are hunched over with much more homework than we had when I was younger. Does the habit of giving kids tablets to entertain them from the age they can comprehend how to use them factor in? Does the practice of only letting babies sleep on their backs contribute? (Yes I know it's supposed to help prevent SIDS) They know that the back sleeping only has caused a flater spot on the skull in people who were raised that way.