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By their first birthday, infants have ______ their birth weight.

A. doubled


B. tripled


C. quadrupled


D. matched

1 Answer

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Final answer:

By their first birthday, infants have typically tripled their birth weight. They double their weight by six months and quadruple it by age two.

Step-by-step explanation:

By their first birthday, infants have typically tripled their birth weight. This growth milestone is part of the rapid physical development that occurs during infancy, where a newborn, on average, doubles their birth weight by six months and triples it by twelve months. A well-nourished infant's growth is steady, with a general pattern of gaining weight and length. By age two, the infant's weight will have quadrupled.

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