A nurse is collecting data from an infant at a well-child visit. The nurse should understand that birth weight typically doubles by what age?

A. Birth weight typically triples by 12 months. B. Birth weight generally doubles by around 6 months of age. C. By 9 months, infants have usually surpassed doubling their birth weight but not yet tripled it. D. By 3 months, infants have not yet doubled their birth weight.