Human development is a predictable process that moves through the stages of infancy, childhood, adolescence, and adulthood. In infancy, we rely on others to meet our needs as we begin to gain. Developmental psychologist Erik H. Erikson () was best known for his theory on social development of human beings, and for coining the phrase identity crisis. The theory describes eight stages through which a healthily developing human should pass from infancy to late adulthood.
Human development, or developmental psychology, is a field of study that attempts to describe and explain the changes in human cognitive, emotional, and behavioral capabilities and functioning over the entire life span, from the fetus to old age.