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Can you put heated up breastmilk back in fridge?

Last updated on April 1, 2026

When it comes to storing heated breast milk, the general recommendation is to avoid putting it back in the fridge after it has been heated. The concern is that once breast milk is warmed, bacteria can start to multiply more rapidly. The CDC guidelines suggest that if you heat breast milk, it should be used within one to two hours.

However, it’s important to note that the actual data indicates that breast milk bacterial levels are stable for several hours and even up to a couple of days in the fridge. While the CDC guidelines prioritize caution, some flexibility might be reasonable.

In practice, if you’ve heated breast milk and your baby doesn’t finish it, it’s best to store it in the fridge and use it promptly. Each situation can vary, so it's essential to consider the specific context when making decisions about breast milk storage.

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