Breast Milk Storage Timeline
Expressed milk has a different shelf life depending on where it is and what has already happened to it — and the clock does not always start when you pumped. Pick where the milk is now and how long it has been there, and this gives the use-by limit, how long is left, and the full CDC reference table so you can check any other bottle at a glance. Every figure comes from the CDC's human milk storage guidance, linked on this page so you can read it yourself.
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Worked example
Learn the method
Inputs
- Where is it now?
Fresh — room temperature / Fresh — refrigerator / Fresh — freezer / Thawed in the fridge / Warmed, or brought to room temperature / Left in the bottle after a feed - Hours since the clock started
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Frequently asked
Where do these numbers come from?
The CDC's breast milk storage and preparation guidance. We show their figures unchanged, including the freezer range — CDC says about 6 months is best and up to 12 months is acceptable, so we show both rather than picking one.
Can I refreeze milk after thawing it?
No. CDC guidance is not to refreeze breast milk once it has thawed.
Why does warmed milk only last 2 hours?
Once milk has been warmed or brought to room temperature, CDC advises using it within 2 hours. That clock starts from warming, not from when you pumped — which is why this tool asks where the milk is NOW rather than only when you expressed it.
My baby didn't finish the bottle — can I save it?
CDC says use leftover milk within 2 hours of the feed ending, and discard it after that.
Is this medical advice?
No. It is a record-keeping and reference aid that reproduces published CDC guidance. Questions about your baby's feeding belong with your pediatrician, midwife, or an IBCLC lactation consultant.