A pediatrician is a doctor who specializes in the health of infants, children, and adolescents, typically caring for patients from birth through age 21. Their training focuses entirely on how children’s bodies grow, develop, and respond to illness, which sets them apart from other primary care doctors. Most parents will see a pediatrician more than any other physician during their child’s first few years of life.
What Pediatricians Do
Pediatricians prevent, detect, and manage physical, behavioral, and developmental issues in children. Day to day, that means a mix of routine checkups and sick visits. During well-child visits, they conduct physical exams, give vaccines, and track your child’s growth in height, weight, and head circumference. They also monitor emotional and social development, looking for signs that a child may need extra support.
Beyond checkups, pediatricians diagnose and treat illnesses and injuries, prescribe medications, and answer the wide range of questions parents bring to every appointment. When a child’s needs go beyond general care, the pediatrician refers the family to a specialist. They also offer guidance on nutrition, sleep, safety, and behavior at each stage of childhood.
Conditions They Commonly Treat
A large share of pediatric visits involve everyday acute illnesses: ear infections, sore throats, the common cold, flu, sinus infections, and hand, foot, and mouth disease. These tend to cluster in the toddler and early school years, when children are exposed to new germs in group settings.
Pediatricians also manage chronic and complex conditions. Asthma is one of the most common, along with ADHD, obesity, and diabetes prevention. They screen for autism spectrum disorder, developmental disabilities, hearing loss, and mental health concerns. Less common but serious conditions like sickle cell disease, childhood cancers, and muscular dystrophy are initially identified or monitored by a pediatrician before a subspecialist takes over long-term management.
Tracking Your Child’s Development
One of the most important things a pediatrician does is monitor developmental milestones, the skills children pick up as they grow. These include physical abilities like walking and grasping objects, language skills like first words and sentences, social behaviors like waving or making eye contact, and cognitive skills like problem-solving and pretend play.
The American Academy of Pediatrics recommends formal developmental screening with standardized tools at 9, 18, and 30 months. Autism-specific screening is recommended at 18 and 24 months. These screenings happen during routine well-child visits and help catch delays early, when intervention is most effective. If you have concerns between visits, your pediatrician can screen at any time.
The Well-Child Visit Schedule
Well-child visits are most frequent during the first two years of life, when growth and development happen rapidly. Newborns are typically seen within a few days of leaving the hospital, then at regular intervals throughout infancy. Visits continue annually through childhood and adolescence. Each visit follows a schedule (called the Periodicity Schedule) that the American Academy of Pediatrics reviews and updates every year to reflect current evidence. At each visit, the pediatrician checks growth, administers age-appropriate vaccines, screens for specific conditions, and discusses what to expect in the months ahead.
Training and Certification
Becoming a pediatrician requires four years of college, four years of medical school, and a three-year residency focused entirely on pediatrics. During residency, doctors train in hospitals and clinics caring for children of all ages, from premature newborns to teenagers. After completing residency, they must pass a certifying exam from the American Board of Pediatrics and hold a valid, unrestricted medical license in their state or province.
This training path is what distinguishes pediatricians from family medicine doctors. A family doctor also completes medical school and residency, but their residency covers a broader range of fields, including internal medicine and gynecology, with less time devoted specifically to children. Both can serve as your child’s primary care doctor, but pediatricians spend all of their training and clinical practice focused on patients under 21.
Age Range for Patients
The American Academy of Pediatrics sets the upper age limit at 21, with exceptions for patients with special health care needs who may continue seeing their pediatrician beyond that age. In practice, many teens transition to an adult primary care doctor somewhere between 18 and 21. The AAP divides adolescence into three stages: early (11 to 14), middle (15 to 17), and late (18 to 21), each with its own set of health considerations. The ideal timing for transitioning to adult care depends on the individual patient and should be a conversation between the family and pediatrician well before the switch happens.
Pediatric Subspecialties
Some children have conditions that require care beyond what a general pediatrician provides. In those cases, your pediatrician will refer you to a pediatric subspecialist, a doctor who completed additional fellowship training (usually two to three more years) in a specific area. The American Board of Pediatrics recognizes 20 subspecialties, including:
- Cardiology for heart conditions
- Neonatal-perinatal medicine for premature or critically ill newborns
- Hematology-oncology for blood disorders and cancers
- Endocrinology for hormone-related conditions like diabetes and growth disorders
- Developmental-behavioral pediatrics for ADHD, autism, and learning disabilities
- Gastroenterology for digestive system problems
- Pulmonology for lung conditions like severe asthma
- Nephrology for kidney disease
- Infectious diseases for complex or unusual infections
Other recognized subspecialties cover areas like sports medicine, sleep medicine, emergency medicine, critical care, adolescent medicine, child abuse pediatrics, rheumatology, and hospice and palliative medicine. Your general pediatrician remains the central point of contact, coordinating care across any specialists your child sees.
Pediatrician vs. Family Doctor
Both pediatricians and family doctors can provide primary care for children, and both are fully licensed physicians. The key difference is depth of pediatric training. Pediatricians spend their entire three-year residency on children’s health, while family doctors split their residency across multiple age groups and specialties. Pediatric offices are also set up specifically for kids, with staff experienced in working with infants and children and equipment sized for smaller patients.
A family doctor offers one practical advantage: the whole family can see the same physician. This can simplify scheduling and help the doctor understand family health history firsthand. For children with complex medical needs, or for families who want a doctor whose entire practice is focused on kids, a pediatrician is typically the better fit. For otherwise healthy children, either option provides competent primary care.