Final answer:
Infants fed with ready-to-use formula usually get the necessary nutrients, but supplementation with vitamin D or iron might be needed, particularly if the formula isn't fortified with adequate levels of these nutrients or the infant has specific health requirements.
Step-by-step explanation:
The subject of your question pertains to the vitamin or mineral supplements that may be required for an infant fed with ready-to-use formula. Infants given ready-to-feed formula generally receive adequate nutrition, including iron, vitamins, and minerals that are necessary for growth and development. However, certain circumstances may necessitate additional supplementation.
Notably, vitamin D and vitamin K are crucial for infants. While vitamin D is necessary for calcium absorption and bone growth, vitamin K is essential for proper blood clotting. Most full-term infants will get sufficient vitamin K from the formula, but vitamin D supplementation may be recommended if the infant isn't exposed to sunlight, or the formula doesn't contain enough of it. It's also important that formulas are fortified with iron to prevent anemia, and supplementation might be needed if the formula is low in iron or if the baby is at an increased risk for iron deficiency.
Regarding the four options provided (Iron B. Fluoride C. Vitamin K D. Vitamin B12), fluoride supplementation is not routinely recommended for infants, as the need for fluoride generally increases with age and the introduction of teeth. Infant formula is typically fortified with sufficient levels of vitamin B12 for those who are not breastfed. Therefore, for an infant being formula-fed, the potential need for supplementation would commonly revolve around vitamin D or iron, depending on the type of formula and the infant's specific health needs.