By about one year of age, birth weight is typically how many times the birth weight?

• A. 2x birth weight.
• B. 3x birth weight.
• C. 4x birth weight.
• D. 5x birth weight.

Answer: (B)

Infants grow fastest in the first year, and weight gain is most rapid early on. By about 12 months, a healthy term baby typically weighs about three times its birth weight (often doubling by around 4–5 months and then reaching roughly triple by one year). This rapid gain reflects both fat and lean mass accumulation with adequate nutrition. By age 2, many children weigh around four times their birth weight. So, the expectation of a threefold increase by one year is the standard milestone.