The nurse is teaching a new mother about the drastic growth and developmental changes her infant will experience in the first year of life. Which statement describes a developmental milestone occurring in infancy?
A) By 6 months of age the infant's brain weighs half that of the adult brain; at age 12 months, the brain weighs 2.5 times what it did at birth.
B) Most infants triple their birthweight by 4 to 6 months of age and quadruple their birthweight by the time they are 1 year old.
C) The head circumference increases rapidly during the first 6 months: the average increase is about 1 inch per month.
D) The heart triples in size over the first year of life; the average pulse rate decreases from 120 to 140 in the newborn to about 100 in the 1-year-old.
Ans: A
By 6 months of age the infant's brain weighs half that of the adult brain; at age 12 months, the brain weighs 2.5 times what it did at birth. Most infants double their birthweight by 4 to 6 months of age and triple their birthweight by the time they are 1 year old. The head circumference increases rapidly during the first 6 months: the average increase is about 0.6 inch (1.5 cm) per month. The heart doubles in size over the first year of life. As the cardiovascular system matures, the average pulse rate decreases from 120 to 140 in the newborn to about 100 in the 1-year-old.
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