The chapter on child development describes how infants and children develop physically, cognitively, and emotionally. Major figures in child developmental theories include Jean Piaget, who focused on cognitive development, Erik Erikson, who explored psychosocial development, and Lev Vygotsky, who studied social and cultural factors in learning and development. Other theories discussed include attachment theory, which emphasizes the importance of secure emotional bonds with caregivers, and behaviorism, which highlights the role of environmental factors in shaping behavior. Overall, the chapter highlights the complex and dynamic nature of child development and the importance of considering multiple factors in understanding how children grow and change.