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Milk Storage: What You Need to Know

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This article has been reviewed by Amanda Weiss, IBCLC. However, this review does not constitute a warranty of medical accuracy and is not intended as medical advice. Always consult a qualified healthcare provider or lactation consultant before making decisions about your health or your child’s health.

 

Knowing how to store breast milk safely can help protect your baby’s health and prevent valuable milk from going to waste. Whether you’re pumping occasionally, returning to work, or building a freezer stash, understanding proper breast milk storage guidelines will help ensure your baby receives safe, nutritious milk whenever they need it.

How to Store Breastmilk Safely

According to the Centers for Disease Control and Prevention (CDC), proper storage keeps breastmilk safe and nutritious for your baby (source https://www.cdc.gov/breastfeeding/recommendations/handling_breastmilk.htm). Here’s what to know:

  • Cleanliness is Key: Always wash your hands before pumping or handling breastmilk. Use clean, sterilized bottles or storage bags.
  • Label Your Containers: Write the date and time of pumping on each container to ensure you use the oldest milk first.
  • Don’t Overfill: Leave an inch of space at the top of the container to allow for expansion when freezing.
  • Avoid Mixing Fresh and Frozen Milk: If you need to combine milk, cool the fresh milk in the refrigerator first.

How Long Can Breastmilk Be Stored?

The shelf life of breastmilk depends on where you store it. According to the CDC, these are the general guidelines:

  • Room Temperature (77°F or cooler): Up to 4 hours.
  • Refrigerator (40°F): Up to 4 days.
  • Freezer (-18°F or colder): Up to 6 months is ideal; up to 12 months is acceptable for safety but may lose quality.

Freezer Storage Tips

  • Use Storage Bags: Lay them flat in the freezer for easy stacking and faster thawing.
  • Store in Small Amounts: Freeze milk in 2–4 oz portions to minimize waste and thaw only what you need.
  • Keep Milk Toward the Back: Store milk in the back of the freezer where the temperature is most consistent.

Thawing Breastmilk

To thaw breastmilk safely, follow these steps:

  • In the Refrigerator: Place the frozen milk in the fridge for slow, even thawing. This can take up to 24 hours.
  • Under Warm Running Water: For quicker thawing, hold the bag or bottle under warm (not hot) water.
  • Avoid Microwaves: The CDC warns against microwaving breastmilk, as it can create hot spots and destroy nutrients (source https://www.cdc.gov/breastfeeding/recommendations/handling_breastmilk.htm).

Can You Refreeze Breastmilk?

The American Academy of Pediatrics (AAP) advises against refreezing thawed breastmilk. Once thawed, use it within 24 hours if kept in the refrigerator (source https://www.healthychildren.org/English/ages-stages/baby/breastfeeding/Pages/Breastfeeding-Pumping-and-Storing-Breastmilk.aspx).

Traveling with Breastmilk

  • Use an Insulated Cooler: Keep milk cold with ice packs; it will stay fresh for up to 24 hours.
  • Plan for TSA Regulations: When flying, inform TSA agents that you’re carrying breastmilk. The TSA allows breastmilk in reasonable quantities and exempts it from the usual liquid restrictions (source https://www.tsa.gov/travel/special-procedures/traveling-children).

Signs Milk Has Gone Bad

Breastmilk may spoil if it isn’t stored properly or used within the recommended time. Discard milk if it:

  • Smells sour or rancid.
  • Appears curdled or separated, even after gentle mixing.
  • Tastes off (if you’re unsure, try a small taste).

Milk Storage Made Simple

By following these milk storage guidelines, you can ensure your baby has safe, high-quality breastmilk whenever they need it. Proper storage not only protects your liquid gold but also gives you peace of mind, knowing your baby is getting the best.

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