Your Complete Guide to Breastmilk Storage.

Written By Sarah Leitch

Breastmilk is a great source of nutrition for your baby, and proper storage ensures that its nutrients and safety are maintained. Below is a detailed guide based on recommendations from the American Academy of Pediatrics (AAP) and the Centers for Disease Control and Prevention (CDC).

Breastmilk Storage Guidelines

Storage Containers

  • What to Use:

    • Glass or BPA-free plastic bottles with tight-fitting lids.

    • Breastmilk storage bags designed for freezing.

  • Labeling:

    • Clearly label the date and time of expression on each container.

    • If storing for childcare, include your baby’s name.

Storage Durations

Storage Location Temperature Timeframe
Room Temperature Up (25°C) - Up to 4 hours
Insulated Cooler Bag (-15–4°C) - Up to 24 hours
Refrigerator (4°C) or below - Up to 4 days
Freezer (-18°C) or below - Up to 6 months
Deep Freezer (-20°C) or below - Up to 12 months

Thawing Guidelines

  • Preferred Method: Thaw breastmilk in the refrigerator overnight.

  • Quick Thawing: Place the sealed container in a bowl of warm water or run under warm tap water.

  • Avoid:

    • Boiling or microwaving breastmilk, as it can destroy nutrients and create hot spots.

  • Usage:

    • Once thawed, use within 24 hours if stored in the refrigerator.

    • Never refreeze thawed milk.

Tips for Proper Handling

Hygiene Matters

  • Wash hands thoroughly before expressing or handling milk.

  • Ensure all pumping equipment and storage containers are sterilized and dry before use.

Portion Milk Wisely

  • Store milk in 2–4oz portions to reduce waste.

  • Leave some room in containers to allow for expansion when freezing.

Layering Milk

  • Cool freshly expressed milk in the refrigerator before combining it with already chilled milk.

  • Do not add warm milk directly to frozen or refrigerated milk.

Safe Feeding Practices

  • Swirl milk gently to mix any separated fat; avoid shaking vigorously.

  • Discard any leftover milk from a feeding after 2 hours to prevent bacterial growth.

FAQs on Breastmilk Storage

Can I Refreeze Thawed Milk?

No. Thawed milk should not be refrozen as it increases the risk of bacterial growth and loss of nutrients.

What Should I Do if My Baby Doesn’t Finish a Bottle?

Unused milk from a feeding should be discarded after 2 hours. Always heat milk in small amounts to minimize waste.

Should I Store Milk in the Door of the Freezer or Fridge?

No. Store breastmilk in the back of the refrigerator or freezer where the temperature is most consistent.

Proper storage and handling of breastmilk help maintain its nutrients and safety for your baby. Following these guidelines ensures your milk is ready to nourish your little one whenever needed. If you have additional questions, consult with a lactation consultant or healthcare provider.

For more tips or personalized guidance, contact us today to schedule a lactation support session!

Sarah Leitch