Heated formula: how long can it remain at room temperature?

How long can microwave-heated formula remain at room temperature before it spoils?


Sue Gilbert

Sue Gilbert works as a consulting nutritionist. For many years she worked with Earth's Best Organic Baby Food, integrating nutrition and... Read more

Formula, like milk, is subject to rapid spoilage at room temperature. If it has been heated, it is even more rapid because heat speeds up the chemical reactions that bring about the degradation.

Therefore, no formula should be out more than two to three hours. Because babies are such a sensitive population to the harm of ingested, unwanted bacteria, I suggest that if a heated formula is not eaten right away, that it immediately be put back in the refrigerator, and then be reheated when needed. Formula should not be kept more than 48 hours at 40 degrees.

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