At 1 year of age, how should an infant's weight compare to birth weight?

• A. Double birth weight
• B. Triple birth weight
• C. Quadruple birth weight
• D. Same as birth weight

Answer: (B)

In the first year of life, growth in weight happens rapidly. Birth weight serves as the baseline, and by about four to six months most infants have doubled their birth weight. By the time they reach one year, they’re typically about three times their birth weight. This tripling reflects the high metabolic and physical growth needs during infancy. So the expected pattern is roughly triple the birth weight at one year. If a child’s weight deviates significantly from this trajectory, it would prompt a closer look on growth charts, but triple birth weight is the standard expectation for a healthy first year.