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Developmental Psychology: A branch of psychology that studies physical, cognitive, and social change throughout the life span

Zygote: The fertilized egg; it enters a 2-week period of rapid cell division and develops into an embryo

Embryo: The developing human organism from about 2 weeks after fertilization to the second month 

Fetus: The developing human organism from 9 weeks after conception to birth

Teratogens: Agents such as chemicals and viruses, that can reach the embryo or fetus during development and cause harm

Fetal Alcohol Syndrome: Physical and cognitive abnormalities in children caused by a pregnant womens heavy drinking 

Habituation: Decreasing responsiveness with repeated stimulation. As infants gain familiarity  with repeated exposure to a visual stimulus their interest wanes and they look away sooner

Maturation: Biological growth processes that enable orderly change in behavior relatively uninfluenced by by experience