Dismiss Modal

Management

Thawing Breastmilk

Choose a preferred language


General guidelines for thawing frozen breastmilk

When thawing frozen breastmilk:

  • Use the oldest milk first, unless recently expressed milk is advised.

  • Thaw breastmilk by putting the collection container in the refrigerator for several hours or overnight.

To thaw more quickly or to heat refrigerated milk, hold the container of milk under warm running water. Or place it in a cup, pot, bowl, or basin of warm water. Don't thaw milk in very hot water or in the microwave. This decreases some of the healthy properties of the milk. It can also create hot spots that may burn your child's mouth. 

It's normal for your milk to separate during storage. You will see a layer of cream (fat) that has risen to the top. To mix the cream with the rest of the milk, gently swirl the bottle. Don't vigorously shake.


Using thawed breastmilk

Tips for using thawed breastmilk include:

  • Milk thawed in the refrigerator must be used within 24 hours.

  • Milk thawed to room temperature or warmer should ideally be used in 1 to 2 hours.

  • If your baby didn't finish the bottle, the leftover breastmilk can still be used within 2 hours after the baby is done feeding. After 2 hours, leftover breastmilk should be discarded.

  • Don't refreeze milk once it has been thawed. 

Featured in

© 2000-2025 The StayWell Company, LLC. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.
Related Articles
Read more →
Breast Health
Storing Expressed Milk

You can express your milk and store it in clean containers. Your partner or a sitter can feed it to the baby. This way, your baby gets the benefits of your milk even when you can't be there at feeding time. Follow these guidelines for milk storage.

Read more →
Breast Health
Storing Your Breastmilk

A helpful look at practical and health considerations when storing your breastmilk.

Read more →
Breast Health
Breastmilk: Pumping, Collecting, Storing

"Fresh breastmilk" contains the most active anti-infective properties. Refrigerated breastmilk has fewer anti-infective properties than fresh milk and frozen breastmilk has the least.

Read more →
Breast Health
Breast Milk Collection and Storage

Detailed information on breast milk collection and storage