Keep it simple
Simple and non-invasive methods should be preferred to manage most injuries in children. While some traumatic injuries may need medical attention, most aches and pains just need a little bit of rest! If pain persists after a few days off, consult a healthcare professional.
A little science
Overtraining and more serious injuries can also happen in children. For more information, read the following article:
Overuse injuries and burnout in youth sports: a position statement from the American Medical Society for Sports Medicine.