My DS didn't roll over until he was 10 months old and never crawled (went straight to walking at 13 months). He is now 4 and is still physically awkward. He can't hop very well and when riding his scooter he can either steer or scoot but not both at the same time. He does football classes and can't run to a stationary ball then kick it. He also does swimming lessons and can either kick his legs or 'scoop' with his arms but not both at the same time. It all seems to be related, ie. difficulty doing two different physical things at the same time. Do you think there could be something wrong?