Bottle Feeding 101: Everything You Need to Know
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Bottles made with powdered formula and kept at room temperature should be used within one hour of being mixed. You can prepare bottles of formula in advance and chill them in the refrigerator for up to 24 hours. After that, they should be discarded. Do not keep the leftovers from a bottle of formula that your baby didn't finish. Also, check the expiration date on your formula container, and use the container within a month of opening it.