Management

Storing Expressed Milk

Choose a preferred language

You can express your milk and store it in clean containers. Your family 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. The guidelines below are based on guidelines from the CDC and the American Academy of Pediatrics (AAP).

Type of storage

Details about storage

Storage times

Room temperature

  • At room temperature (up to 78°F or 26°C)

  • Tip: Keep the container clean, covered, and cool.

Up to 4 hours

Refrigerator

  • In a refrigerator (less than 39°F or less than 4°C)

  • Tip: Place milk in the back of the main section of the refrigerator.

Up to 4 days

Freezer

  •  In a freezer (0°F or -17°C)

  • Tip: Store milk toward the back of the freezer.

  • Never refreeze milk after it has been thawed. Once it is thawed, use right away or refrigerate no longer than 24 hours.

6 months is best; up to 12 months is acceptable if stored in deep freezer at -4°F (-20°C) or colder


Guidelines for milk storage

Always use a clean container to collect and store milk. Never pour warm expressed milk into a bottle with cold milk. And be sure to label and date each bottle or bag of milk. To store milk safely, see the chart above.

Woman putting bag of breast miilk into freezer.


Warming stored milk

Thaw frozen milk in the refrigerator or in a bowl of warm water. It’s a good idea to warm refrigerated milk before using it. For your baby’s safety:

  • Use the oldest milk first.

  • Warm a container of milk by putting it in a bowl of warm (not hot) water for a few minutes. Or use a bottle warmer set on low.

  • Gently swirl the milk to mix it. Then place a few drops on your wrist. The milk should be near room temperature.

  • Don’t put the milk in a microwave. This could create pockets of hot liquid that can burn your baby’s mouth.

Featured in

© 2000-2026 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.

Mammograms Made Easy

Schedule your mammogram at a time and  location that is convenient for you. Available on Oʻahu and Kauaʻi.

Schedule Today
Related Articles
Read article
Breast Health
How to Bottle-Feed

Newborns need good nutrition and plenty of loving - 2 things you can supply with bottle-feeding. There are many formulas, so ask your healthcare provider which is best for your baby.

Read article
Breast Health
Breastfeeding: Getting Started

The first weeks of breastfeeding should be considered a learning period for both you and your baby. Here's what you need to know.

Read article
Breast Health
Breastfeeding: Latch On

Here are images that show the steps for helping your baby to latch on for breastfeeding.

Read article
Breast Health
Breastfeeding Your Premature Infant at Home

Until now, your baby has been cared for in the NICU (neonatal intensive care unit). You’ve started breastfeeding. And you are now ready to move on to full breastfeeding at home. This sheet can answer some of your questions about making this transition.