By what age does an infant's birth weight usually triple?

By what age does an infant's birth weight usually triple?

• A. 9 months
• B. 1 year
• C. 18 months
• D. 2 years

Answer: (B)

Infants gain weight rapidly in the first year. Birth weight typically doubles by about 4 to 6 months and triples by about 12 months, reflecting the high energy needs for growth and development during this period. Because of this pattern, the age at which an infant’s birth weight is usually tripled is around 1 year. After the first year, weight continues to rise and by about 2 years most children have roughly quadrupled their birth weight.

Infants gain weight rapidly in the first year. Birth weight typically doubles by about 4 to 6 months and triples by about 12 months, reflecting the high energy needs for growth and development during this period. Because of this pattern, the age at which an infant’s birth weight is usually tripled is around 1 year. After the first year, weight continues to rise and by about 2 years most children have roughly quadrupled their birth weight.