Child behavior development progresses through distinct stages from infancy to adolescence, shaped by both innate factors and environmental influences. During early childhood, infants rely on instincts which gradually give way to purposeful actions as motor skills and cognition advance. As toddlers, children's behavior becomes marked by curiosity and exploration of their surroundings. In the school-age years, behavior structures and children develop identity through peer and authority validation as cognitive abilities rapidly grow. Adolescence brings profound changes as hormonal shifts occur and peer relationships gain significance alongside drives for independence and risk-taking behaviors that emerge. Throughout, caregiver and environmental support foster healthy development while adverse experiences can cause challenges.