PSYC 4070 Chapter : Dev Psyc Chapter 5
Document Summary
Chapter 5 the first two years: biosocial development. In infancy, growth is so rapid and the consequences of neglect are so severe that gains are closely monitored. Infants usually double their birthweight by the fourth month and triple it by age 1. Physical growth then slows but is still rapid. By age 2, toddlers are half of their adult height and about a fifth of their adult weight. Much of the weight increase in the early month is fat. Baby fat is stored to keep the brain nourished if teething or sniffles interfere with eating. Head-sparing a biological mechanism that protects the brain when malnutrition affects body growth. The brain is the last part of the body to be damaged by malnutrition. Percentile a point ranking scale of 0 to 100. The 50th percentile is the midpoint; half of the people in the population being studied rank higher and half rank lower.
