There are many young athlete injuries that are directly a result of muscle tightness during growth spurts. General injury prevention considerations for your children involved in sports are those habits that overall contribute to a healthy child. Drinking enough water or sport drink before ,during and after activity, especially in the warm months outdoors and all months indoors is critical. Because children's weight and size proportions are different than adults they are less effective at cooling themselves during exertion therefore become dehydrated quicker. Thirst is a too late indicator of needing fluids.
Water is still the fluid of choice for the young athlete.
Finally, the biggest thing that parent can do to prevent sports related injuries in their son or daughter that they are kids. Do not allow organized team sports to eliminate free play time or exercising with a family member. This allows your children to understand and value physical activity. Please read this.