of Human Development Think about the lifespan and make a list of what you would consider the basic periods of development How many periods or stages are on your list Perhaps you have three childhood adulthood and old age Or maybe four infancy childhood adolescence and adulthood Developmentalists often break the lifespan into eight stages Prenatal Development conception gestation Infancy and Toddlerhood birth to 2 yrs Early Childhood 3 yrs 5 yrs Middle Childhood 6 yrs 11 yrs Adolescence 12 yrs 18 19 yrs Early Adulthood 20 yrs mid 30s Middle Adulthood late 30s to mid 60s Late Adulthood 65 yrs 79 yrs Instructions Match the description with the important milestone observed during or by the end of the period of human development 1 Initially have interesting conceptions of size time space and distance such as fearing that they may go down the drain if they sit at the front of the bathtub Keen sense of hearing but very poor vision 2 3 Preschool years consisting of the years which follow toddlerhood and precede formal schooling 4 Dramatic growth and change 5 harder time remembering and attending to information 6 Skin continues to lose elasticity reaction time slows further muscle strength and mobility diminishes hearing and vision decline and the immune system weakens 7 All the major structures of the body are forming 8 Love and work are primary concerns at this stage of life 9 Begins make believe play 10 Dresses and undresses without help 11 Recognizes the speakers sound and calms down when spoken to 12 dramatic physical change marked by an overall physical growth spurt and sexual maturation known as puberty 13 At our physiological peak but are most at risk for involvement in violent crimes and substance abuse