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Questions and Answers
What is the average weight of a newborn girl in the United States?
What is the average weight of a newborn girl in the United States?
- 6.98 pounds
- 7.76 pounds
- 8.00 pounds
- 7.45 pounds (correct)
At what age does a child's weight approximately quadruple since birth?
At what age does a child's weight approximately quadruple since birth?
- 6 months
- 1 year
- 3 years
- 2 years (correct)
How much does the average 2-year-old boy weigh?
How much does the average 2-year-old boy weigh?
- 26 pounds
- 30 pounds
- 28 pounds (correct)
- 32 pounds
By age 25, what percentage of total body length does the head comprise?
By age 25, what percentage of total body length does the head comprise?
What is the average height of a 1-year-old boy?
What is the average height of a 1-year-old boy?
Flashcards
Sex differences in weight and height at birth
Sex differences in weight and height at birth
At birth, boys are typically heavier and taller than girls, but these differences are small and there is a lot of overlap.
Infant weight growth
Infant weight growth
A newborn's weight doubles by 4 months and triples by 1 year.
Toddler weight growth
Toddler weight growth
By age 2, a child's weight has quadrupled.
Body proportion changes with age
Body proportion changes with age
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Head size proportion
Head size proportion
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Study Notes
Sex Differences in Growth
- Newborn boys are slightly heavier (average 7.76 pounds) and taller (average 19.68 inches) than newborn girls (average 7.45 pounds, 19.48 inches).
- Size distributions overlap significantly; many girls are as large as the average boy, and many boys are as small as the average girl.
- Weight doubles by 4 months and triples by 1 year.
- By age 2, weight quadruples; average 2-year-old boy weighs 28 pounds and girl 26.69 pounds.
- Average height at 1 year is 29.96 inches for boys and 29.28 inches for girls.
- Average height at 2 years is 34.51 inches for boys and 33.93 inches for girls.
- Consult the CDC website for detailed percentile growth charts.
Body Proportions
- Body proportions change dramatically from birth to adulthood.
- Newborn infants' brains are disproportionately large relative to their bodies compared to adults.
- Body growth exceeds head growth significantly during childhood and adolescence.
- Newborns' heads are proportionately larger than their bodies near the adult size.
- At birth, the head accounts for about 25% of body length; this decreases to roughly 20% by age 25.
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