PSYB20H3 Midterm: PSYB20 Midterm 2 chapters 5- 10

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Week 5 chapter 5: physical development and health, birth to age 3. The first three years are a time of explosive growth and development. The developing body grows in an orderly and patterned way. According to the cephalocaudal principle = growth occurs from top down: a newborn baby"s head is disproportionately large. At 1 year, the brain is 70 percent of its adult weight, but the rest of the body is only 10 to 20 percent of its adult weight. The head becomes proportionately smaller as the child grows in height and the lower parts of the body develop. Sensory and motor development follow the same principle; infants see objects before they can control their torso, and they learn to use the upper parts of the body before the lower parts. Growth is faster in the first few months of life than it ever will be again.

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