How long does it typically take for an infant to double its birth weight?

How long does it typically take for an infant to double its birth weight?

• A. 4 to 6 months
• B. 1 to 2 months
• C. 9 to 12 months
• D. 12 to 18 months

Answer: (A)

Infant growth milestones show that birth weight is typically doubled by about four to six months. After an initial early weight regain, healthy term babies gain weight steadily—roughly 20 to 30 grams per day—so reaching twice the birth weight around four to six months fits the common growth pattern. By about a year, many infants have tripled their birth weight, though exact timing can vary with feeding, health, and prematurity. Other timeframes fall outside this usual window for doubling birth weight.

Infant growth milestones show that birth weight is typically doubled by about four to six months. After an initial early weight regain, healthy term babies gain weight steadily—roughly 20 to 30 grams per day—so reaching twice the birth weight around four to six months fits the common growth pattern. By about a year, many infants have tripled their birth weight, though exact timing can vary with feeding, health, and prematurity. Other timeframes fall outside this usual window for doubling birth weight.