This document provides an overview of pediatrics and key health issues impacting children. It discusses how pediatrics focuses on medical care for infants, children and adolescents up to age 18. The top causes of death for children under 5 are pneumonia, diarrhea, malaria and measles, which can often be prevented or treated with low-cost interventions. Adolescents also face health risks like accidents, violence and illness related to behaviors started during this period. The document outlines developmental periods from prenatal to early childhood and indicators used to measure infant and child health outcomes.