How long can unused prepared formula be stored and still be used?

• A. Up to 72 hours
• B. Up to 24 hours
• C. Up to 48 hours and then discarded
• D. Indefinitely

Answer: (C)

Safely handling prepared infant formula hinges on controlling bacterial growth after mixing. Once formula is prepared, keeping it cold slows any bacterial growth, but it isn’t sterile. The guideline you’re studying allows unused prepared formula to be stored in the refrigerator for up to 48 hours, after which it should be discarded. This window balances minimizing waste with reducing the risk of illness from spoiled formula. Store it at 4°C (39°F) or below, in a sealed bottle or container, and label with the preparation time. If you notice any off smell, changes in color or texture, discard immediately. In contrast, formula left at room temperature should be discarded much sooner, and formula kept indefinitely is unsafe.