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Infancy, among humans, the period of life between birth and the acquisition of language approximately one to two years later. During this period, infants develops physical and cognitive skills, such as; babbling, sitting, crawling, and eventually walking and speaking their first words.

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Middle childhood is a stage where children move into expanding roles and environments. During this time, children experience rapid growth in their physical abilities, such as coordination and lung capacity, and cognitive skills like complex problem-solving. Children on this stage tends to explore their environment.

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Adolescence is the period of development that begins at puberty and ends at early adulthood or emerging adulthood. In this stage, rapid changes of the body was observed, along with the hormonal changes and an array of learning capacities. There are three stages of adolescence;

1. Early Adolescence (Ages 10 to 13)

2. Middle Adolescence (Ages 14 to 17)

3. Late Adolescents (Ages 18-21+)

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The developmental changes may vary. In this period, changes in physical appearance were more observed than the previous stage of development. Different careers were also emerged during this stage.

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During this period, changes of physical development were observed. A period where an individual meets social and civil obligations and at risk of health.