Lower back pain, shin splints and even "little league" elbow - a result of repeated throwing - can arise. Kids who get hurt need to heal completely or risk reinjury when they return to the field. Be sure she's been cleared by a doctor and is completely healthy before resuming activity if your child is hurt. To prevent injuries, be sure the activity is supervised by trained adults or coaches. Match the activity and team with your child's size and skill level before she begins, and have the pediatrician clear her for the activity. Head, eye and other bodily injuries can be prevented with the right protective equipment. Be sure the playing surface is cleared of debris and other impediments before play begins. And as you would while working out, be sure the team has a warm-up and cool-down period to condition muscles for play.