AP PSYCHOLOGY

Detailed explanation-1: -The first year of life is a time of amazing change during which babies, on average, grow 10 inches (25 centimeters) in length and triple their birth weights. Given all the growth that happens then, new parents might be surprised when their child doesn’t continue to grow so fast after the first year.

Detailed explanation-2: -While all babies may grow at a different rate, the following is the average for boys and girls 1 to 3 months of age: Weight: average gain of about 1½ to 2 pounds each month. Height: average growth of over 1 inch each month. Head size: average growth of about ½ inch each month.

Detailed explanation-3: -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. In boys, half the adult height is attained by about age 2.

Detailed explanation-4: -As an infant, she may have gained 4 pounds (1.8 kg) in four months or less, but during the entire second year, 3 to 5 pounds (1.4–2.3 kg) probably will be her total weight gain. Continue to plot her measurements every few months on growth charts to make sure she’s generally following the normal growth curve.