Christopher Jobe
Nothing to be concerned about. When I was 13, I was 4'7" and weighed 75 lbs. My parents were naturally quite concerned and had the same answer from the doctors. All kids grow at different rates. I am now 33, 5'10" and weigh 190 lbs. Don't worry, just encourage him to be outgoing. Then he won't be teased about his size. It worked for me.