Supervising the health of children requires medical training. They're at risk for plenty diseases, from chicken pox to pneumonia. And no matter what ails children, they need to be treated in a way that is appropriate to their age and weight. Even the nutritional needs of children are different from those of adults.
As a pediatrician, you may advise parents on taking care of their first baby, diagnose childhood cancer, and recognize the symptoms of an eating disorder. If you become a pediatrician, your impact on the health of children will stretch all the way into their adult lives.