AP PSYCHOLOGY

Detailed explanation-1: -Healthy infants come in a range of sizes. But looking at the average growth, most babies have tripled their birth weights by the first birthday. Their heads have grown by about 4 to 5 inches (about 10 to 13 centimeters). And most babies grow about 9.5 inches (24 centimeters) longer in the first year.

Detailed explanation-2: -Babies – birth to 6 months of age Babies usually double their length and triple their weight between birth and one year of age.

Detailed explanation-3: -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.

Detailed explanation-4: -General guidelines for growth A useful guide is that most healthy, full-term newborn babies double their birth weight by 4 months. A boy’s weight will triple in about 13 months. A baby girl’s weight will triple in about 15 months. However, all babies grow at their own pace.

Detailed explanation-5: -Infancy and Toddlerhood (birth through two years) Early Childhood (3 to 5 years) Middle Childhood (6 to 11 years) Adolescence (12 years to adulthood)