Storing expressed milk safely is mostly about time and temperature. The timings below follow CDC breast milk storage guidance, the standard reference for expressed milk at home.
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The Safe Storage Times
- Room temperature: use freshly expressed milk within 4 hours.
- Fridge: use within 4 days.
- Freezer: ideally use within 6 months; up to 12 months is acceptable.
These times assume milk was expressed and handled cleanly. If milk has been out beyond the safe times, throw it out. When in doubt, throw it out — milk that has sat too long is not worth the risk to your baby.
How to Store Milk in the Fridge
Put milk in the fridge as soon as you can after expressing. Store it at the back of the fridge, not in the door: the back is where the temperature stays steadiest, while the door warms every time it opens.
Label every container with the date the milk was expressed, and use the oldest milk first, so nothing sits beyond its safe time.
Thawing and Using Stored Milk
- Thaw frozen milk in the fridge and use it within 24 hours of thawing.
- Never refreeze milk once it has thawed.
- Once milk is warmed, use it within 2 hours.
Milk that has been warmed, or that is left over in the bottle after a feed, must be used within 2 hours or discarded. It must not be put back in the fridge for later, because bacteria introduced during the feed can grow in it.
Simple Habits That Keep Milk Safe
- Wash your hands before expressing or handling milk.
- Use clean containers or purpose-made storage bags, sealed properly.
- Store milk in small portions so less is wasted if a feed is cut short.
- When travelling, carry milk in a cooler with frozen ice packs and move it to a fridge or freezer as soon as you arrive.
This article is general information only and is not medical advice. Please consult a healthcare professional for personal advice.