This document provides an overview of child development from infancy through adolescence. It discusses the major domains of development - physical, cognitive, and socioemotional. It also outlines several influential theories of child development, including psychoanalytic theory, behavioral theory, cognitive theory, biological theories, and systems theories. Research methods used to study child development such as descriptive research, correlation research, experiments, and longitudinal studies are also summarized. Finally, the document discusses how research in child development informs social policy to improve outcomes for children and families.