A couple presents with their newborn baby for a 2-week well check. Per the caregiver's report, the baby has been breastfeeding well and has regained their birth weight. The NP reports to the caregivers that breastfed babies are expected to regain their birth weight at 10-14 days. They ask what they can expect to see for weight gain over the next few months. At what age can most caregivers expect their baby to double their birth weight? A. By age 2-3 months B. By age 3-4 months C. By age 4-6 months D. By age 7-9 months