A nurse is assessing a 12-month-old infant. Which statement best describes the infant's physical development a nurse should expect to find?
a. Anterior fontanel closes by age 6 to 10 months.
b. Binocularity is well established by age 8 months.
c. Birth weight doubles by age 5 months and triples by age 1 year.
d. Maternal iron stores persist during the first 12 months of life.
ANS: C
Growth is very rapid during the first year of life. The birth weight has approximately doubled by age 5 to 6 months and triples by age 1 year. The anterior fontanel closes at age 12 to 18 months. Binocularity is not established until age 15 months. Maternal iron stores are usually depleted by age 6 months.
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