Quick answers on how long breastmilk stays safe — at room temp, in the fridge, in the freezer, after thawing. Based on CDC and AAP guidelines.
| Storage Location | Freshly Expressed | Thawed | Leftover |
|---|---|---|---|
| 🌡️ Room Temp ≤ 77°F / 25°C |
4 hours | 1-2 hours | 2 hours |
| 🧊 Cooler with Ice 5-39°F / -15-4°C |
24 hours | Not recommended | Not recommended |
| ❄️ Refrigerator ≤ 40°F / 4°C |
4 days | 24 hours | 2 hours from start |
| 🧊 Freezer ≤ 0°F / -18°C |
6 months (best) 12 months OK |
Never re-freeze | Discard |
Date and time it was pumped. Use the oldest milk first.
Don't combine warm freshly pumped milk with already-chilled milk. Cool the fresh first.
2-4 oz portions reduce waste — once thawed and partly used, the rest must be discarded.
Milk expands when frozen. Don't fill bags or bottles to the top.
Overnight in the fridge or under warm running water. Never microwave.
High lipase can give milk a soapy smell — it's still safe. When in doubt, taste it. Sour = discard.