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This topic will survey what is known about how children develop between birth and age 2 weeks (Elizabeth B Hurlock. 1953), a period known as infancy. Children develop in many different ways at the same time. A different aspect of children’s development is never at rest or waiting for other parts to catch up. Instead, development is simultaneous. While physical growth and maturity are the most obvious signs that develop cognitively (mentally), socially, emotionally and sexually.