I recommend parents of young athletes read this article from Orthopedics Today, which speaks to the benefits of team sports, as well as the importance of finding a balance to avoid injuries and overuse.
Excerpt from article: “The goal of sports is participation at first. But as competition and team play ensues, children learn about teamwork, helping others and fairness, and begin to define social values. During this time, they experience a growth and further development of their intellect. The growth in intelligence, related to both genetics and environment, happens rapidly during youth. The ability to gain new knowledge may be at its highest point. This coincides with physical growth and development. Children learn about the balance and synergy between their minds and physical abilities. They learn about exercise, proper nutrition, sleep and coping mechanisms for stress. The lessons are fostered and enhanced through their relationships with parents, siblings, other family members, teachers and coaches.”