AP PSYCHOLOGY

Detailed explanation-1: -Physical growth refers to an increase in body size (length or height and weight) and in the size of organs. From birth to about age 1 or 2 years, children grow rapidly. After this rapid infant and early toddler growth, growth slows until the adolescent growth spurt.

Detailed explanation-2: -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-3: -Phase 1 (from birth to about age 1 to 2 years): This phase is one of rapid growth, although the rate of growth decreases over that period. Phase 2 (from about 2 years to the onset of puberty): In this phase, growth occurs in relatively constant annual increments.

Detailed explanation-4: -During infancy, the brain experiences a large amount of growth. There is an explosion of synapse formation between neurons during early brain development. This is called synaptogenesis. This rapid period of synaptogenesis plays a vital role in learning, memory formation, and adaptation early in life.