AP PSYCHOLOGY

Detailed explanation-1: -True or False? Most infants gain several pounds in the first five days of life. False-Most infants lose weight in the first five days of life.

Detailed explanation-2: -What part of an infant grows most in the first two years? From two weeks after conception to two years after birth, the brain grows more rapidly than any other organ, reaching about 25 percent of its adult weight at birth and almost 75 percent of its adult weight by age 2.

Detailed explanation-3: -What specific facts indicate that infants grow rapidly in the first year? Infants typically double their birthweight by the fourth month and triple it by age 1. For example, a 7-pound newborn might be 14 pounds at 4 months and 21 pounds at 1 year (from 3, 250 to 6, 500 to 9, 750 grams).

Detailed explanation-4: -Which of the following statements is true of infants who score extremely low on the Bayley scales? They may have serious developmental problems and require intervention.

Detailed explanation-5: -In general, length in normal-term infants increases about 30% by age 5 months and more than 50% by age 12 months. Infants typically grow about 10 inches (25 centimeters) during the first year, and height at 5 years is about double the birth length.