The difference between pediatric services and a pediatrician is that the former is a type of medical service while the latter is a provider. Pediatric services can be provided by pediatricians, family doctors, and others. However, due to their extensive training and specialization, many parents choose a pediatrician to provide pediatric services to their children.   Pediatricians typically treat patients under the age of 18, though some will see patients as old as 21. Depending on their experience, family doctors may see patients of any age or may only see patients over a certain age.   Medical school and residency training are required for both pediatricians and family doctors. In order to become a pediatrician, one must complete a residency in pediatrics. A family doctor completes a residency in family medicine, which also includes training in adult medicine and geriatrics (care for the elderly).   A pediatrician is then licensed to practice medicine by the American Board of Pediatrics. In the same way, family physicians are certified by the American Board of Family Medicine.   In spite of the fact that both types of doctors are fully capable of caring for and treating patients, pediatricians specialize in children and have a deeper understanding of their growth, development, and behavior.