Do any of you guys know or have any boys who got into weight lifting at an early age and think that it may have stunt their growth? Just got my son back from the pediatrician and he's at the top of their charts for both height and weight. He's 12, goes 5'6" and weighs 140 lbs. He shows abs, so he's fairly lean. He wants to start lifting weights but another guy said it will stunt his growth. Does anyone have any personal experience with this or thoughts?