Child development is the period of physical, cognitive, and social growth that begins at birth and continues through early adulthood. This lesson discusses the theories, stages, and major milestones of child development and ends with a quiz to test what you have learned. Have you ever wondered how you learned to crawl and then walk? How about language? How in the world do human beings learn to talk? Developmental psychologists seek to answer these types of questions. Child development refers to the process through which human beings typically grow and mature from infancy through adulthood. The different aspects of growth and development that are measured include physical growth, cognitive growth, and social growth. Child development focuses on the changes that take place in humans as they mature from birth to about age 17.
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