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The early child period is considered to be the most important developmental phase throughout the lifespan.
Stages of Adolescent Development Adolescence is a challenging period for both children and their parents. Three stages of adolescence-early, middle, and late, are experienced by most teens, but the age at which each stage is reached varies greatly from child to child.These different rates of maturation are connected to physical development and hormone balance, neither of which the child can control.hree stages of adolescence-early, middle, and late, are experienced by most teens, but the age at which each stage is reached varies greatly from child to child. These different rates of maturation are connected to physical development and hormone balance, neither of which the child can control.