How Long Can Breast Milk Stay in the Fridge?
By Lansinoh UK | Published: 2026-10-17
Category: Tips & Care
Learn how long expressed breast milk keeps in the fridge, how to store it safely in breastmilk storage bottles, and when to toss leftover milk.
Quick answer
Freshly expressed breast milk can be stored in the back of the fridge (at 4°C or below) for up to 4 days. For best quality, use it within 3 days. Always store milk in clean, sealed breastmilk storage bottles and label them with the date.
Where to place bottles in the fridge
The temperature inside a fridge varies. The door is the warmest spot, so always store expressed milk toward the back, where the temperature stays most consistent. A dedicated shelf away from raw meat or strong-smelling foods helps keep the milk fresh and free from odour transfer.
How to cool freshly expressed milk
If you plan to combine milk from different pumping sessions, cool the freshly expressed milk in the fridge first before adding it to already-chilled milk. Pour the cooled milk into a breastmilk storage bottle that already contains cold milk. This prevents warming the stored batch and reduces the risk of bacterial growth.
Thawed or leftover milk: different rules
Once breast milk has been thawed from the freezer, it can stay in the fridge for up to 24 hours. Do not refreeze it. Leftover milk from a partially finished bottle should be used within 2 hours. If your baby does not finish a bottle, discard the remainder rather than returning it to the fridge.
Diagnosis: Is your stored milk still safe?
- Symptom: Milk has been in the fridge longer than 4 days, or you are unsure when it was expressed. Check the date label. If no date or older than 4 days, discard.
- Likely cause: Milk was not labelled immediately, or the bottle was placed near the fridge door where temperature fluctuates. Always label each breastmilk storage bottle with the date and time before refrigerating.
- Corrective action: Move bottles to the back of the fridge, use the oldest milk first, and set a reminder to use milk within 3 days for best quality. If milk smells sour or looks separated after gentle swirling, discard it.
- When to stop or choose another option: If you regularly cannot use milk within 4 days, freeze it instead. Freezing stops the clock and keeps milk safe for months. Use Lansinoh breastmilk storage bottles for fridge storage and switch to freezer bags for longer-term storage.
Product facts
- Breastmilk Storage Bottles: Storing expressed breast milk allows parents to have milk ready for their baby whenever they need it. Designed to connect to all Lansinoh breast pumps, our pack of 8 Breast Milk Storage Bottles are a safe and convenient solution for storing milk. Having multiple bottles on hand means you can rotate your fridge stash easily, always using the oldest milk first while keeping fresh milk sealed and ready.
