How long is a leftover breast milk in a bottle good to use?
Last updated on July 1, 2025
Leftover breast milk in a bottle should be used within one to two hours after your baby has started feeding. If it’s not consumed within that time frame, it’s best to throw it away to avoid any risk of bacterial growth. The concern here is that once the milk has been in contact with your baby's mouth, bacteria can be introduced into the milk, increasing the chances of it spoiling.
While the CDC guidelines are strict about this, some evidence suggests that the bacterial count in breast milk remains stable for a longer period of time when stored properly. However, it’s always wise to prioritize safety and follow the recommended guidelines to keep your little one healthy.
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