This document summarizes research on the effects of electronic media on children. It finds that children today are exposed to many hours of media per day, which can negatively impact their health and development in several ways. Excessive media exposure is linked to increased aggressive and violent behavior in children. It is also associated with poorer school performance, social isolation, attention issues, and increased risk of obesity. While some positive effects are possible, parents and professionals should aim to limit children's exposure to violent or bothersome content and encourage healthier activities instead of excessive media use.