Pediatrics is the branch of medicine that involves the medical care of infants, children, and adolescents.Pediatricians work both in hospitals, particularly those working in its specialized sub-fields such as neonatology, and as primary care physicians.

For purposes of this guidance, we are defining pediatric subpopulations as shown below.


Pediatric Subpopulation Approximate Age Range
newborn birth to 1 month of age
infant 1 month to 2 years of age
child 2 to 12 years of age
adolescent 12-21 years of age