alleryStart learning →Water makes up about what percentage of body mass in infants?
AAbout 55 percent
BAbout 45 percent
CAbout 75 percent
DAbout 90 percent
Answer & Solution
Correct answer: C. About 75 percent
1. The proportion of the body made of water falls steadily from birth to old age.
2. In infants that proportion is about 75 percent of body mass.
3. Adult men and women sit lower, and old age drops lower still.
4. This high starting water fraction is why infants dehydrate dangerously fast.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 26 "Fluid, Electrolyte, and Acid-Base Balance", section 26.1 Body Fluids and Fluid Compartments_
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