To prevent overuse injuries, try few common sense rules:
A good suggestion is getting to know your child's coach. Find out whether the coach is more interested in winning or making sure children are having fun.
Take it seriously when a child complains of pain, especially if he or she is going through a growth spurt.
The goal of sports should be to improve health and to make exercise a lifelong activity. The attitude of parents shouldn't be "did you win?" but "what did you learn?"