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The early child period is considered to be the most important developmental phase throughout the lifespan.
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.esson Summary. Child development is a process of maturation that includes infancy, early childhood, middle childhood and adolescence. There are many theories in the field of child development, including those of Freud, Erikson and Vygotsky. Infancy begins at birth and lasts until age two.