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Breast Milk Storage Calculator
Find out exactly how long your breast milk is safe to use based on when it was pumped and where it's stored. Based on CDC guidelines.
Based on CDC guidelines · Last updated October 2026 · Read our medical disclaimer
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Room Temp
Up to 77°F / 25°C
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Insulated Cooler
With ice packs
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Refrigerator
39°F / 4°C
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Freezer
0°F / -18°C
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Breast Milk Storage Guidelines (CDC)
For healthy, full-term babies. Guidelines for premature or sick babies may differ — ask your healthcare provider.
| Storage Location | Temperature | Fresh Milk | Thawed Milk |
|---|---|---|---|
| Room temperature | Up to 77°F (25°C) | Up to 4 hours | Never refreeze |
| Insulated cooler bag | 59°F (15°C) with ice | Up to 24 hours | N/A |
| Refrigerator | 40°F (4°C) or colder | Up to 4 days | Within 24 hours |
| Refrigerator freezer | 0°F (-18°C) | Up to 6 months | Within 24 hours |
| Deep/chest freezer | -4°F (-20°C) | Up to 12 months | Within 24 hours |
Source: CDC (Centers for Disease Control and Prevention) — Proper Handling and Storage of Human Milk
Breast Milk Storage Tips
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Label Every Bag
Always write the date and time on milk storage bags before freezing. Use the oldest milk first (first in, first out).
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Store in Small Portions
Store milk in 1–4 oz portions to reduce waste. Thaw only what baby needs for one feeding.
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Back of the Fridge/Freezer
Store milk at the back of the fridge or freezer where temperature is most consistent — not the door.
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Thaw Safely
Thaw frozen milk in the fridge overnight or under warm running water. Never microwave — it destroys nutrients and creates hot spots.
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After Feeding
Milk left in a bottle after feeding should be used within 2 hours or discarded — not refrigerated again.
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Trust Your Nose
Fresh milk may have a slightly soapy smell (due to lipase — it's safe). Sour or rancid smell means it has spoiled and should be discarded.
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See All Tools →❓ Frequently Asked Questions
How long can breast milk stay at room temperature?
Freshly expressed breast milk is generally safe at room temperature (up to 77°F/25°C) for about 4 hours. Cooler rooms can extend this slightly, but when in doubt, refrigerate sooner rather than later.
Can I refreeze breast milk after it's been thawed?
No — once breast milk has been thawed, it should not be refrozen. Thawed milk can be kept in the fridge for up to 24 hours and used within that window.
How do I know if stored breast milk has gone bad?
Spoiled milk often smells sour or soapy and may look separated in a way that doesn't recombine when swirled gently. When genuinely unsure, it's safest to discard it rather than risk it.
Does this calculator follow CDC or WHO guidelines?
This tool follows CDC (Centers for Disease Control and Prevention) storage guidelines, which are widely used as a reference across the USA, UK, and Australia.
Can I combine milk from different pumping sessions?
Yes — milk from different sessions on the same day can generally be combined, as long as each batch was properly cooled first before combining. Avoid mixing milk of very different ages (e.g. freshly pumped with milk that's already several days old).
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Breast Milk Storage Calculator — Results
| Pumped | |
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Based on CDC guidelines. Generated by babyaalam.com/tools/breast-milk-storage/