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Birth weight is about tripled by:

Aone year
Bsix months
Ctwo years
Dthree years
Answer & Solution
Correct answer: A. one year
1. Physical growth is fast after birth and then slows. 2. Birth weight is doubled in the first four months and tripled by one year. 3. It is not quadrupled until two years. _Source: Wikipedia, "Child development" (rev 1378784615), section "Speed and pattern"_
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