“Storing Breast Milk: 15 Fridge, Freezer & Travel Tips for 2025”

Storing breast milk properly is essential for ensuring your baby receives safe and nutritious milk—whether you’re at home or on the go. As a new mom in 2025, understanding the right techniques for storing breast milk can help reduce waste, maintain milk quality, and make feeding easier during busy moments. From refrigeration to freezing, and even using glass bottles, jars, or storing milk while traveling, this guide walks you through everything step by step. So, let’s explore the best and safest methods to keep your expressed milk fresh, organized, and ready when your little one needs it most. 36 Weeks Pregnant Symptoms, Signs & What to Expect — Learn what changes your body and baby go through as you approach full term.

Watch the original How to Safely Store Your Liquid Gold: Breast Milk Storage Guide

Watch this helpful video by Medical Centric on YouTube

How to Store Breast Milk (General Guidelines)

To begin with, proper breast milk storing techniques are essential to ensure your baby receives safe and nutritious milk. In fact, both the CDC and WHO emphasize following strict hygiene and temperature guidelines to avoid contamination.

Now, let’s explore the basic shelf life of expressed breast milk in different storage conditions, based on the latest 2025 recommendations:

Moreover, always label each milk container with the date and time it was expressed. This small step helps you use the oldest milk first, which reduces waste and ensures freshness.

As we move forward, the next sections will guide you through more specific storage scenarios—including storing in the fridge, freezer, glass bottles, and during travel. If you’re looking for a hands-free solution for pumping on the go, check out our complete guide to Willow Wearable Breast Pumps for a comparison of Willow Go, Willow 360, and more.

Storing Breast Milk in the Fridge

When it comes to storing breast milk in the fridge, following best practices ensure your milk stays fresh and safe for your baby. In general, refrigeration is ideal for short-term storage and offers better nutrient preservation compared to freezing. If you’re interested in learning more about Spectra breast pumps—including the Gold, S1, and S2 models, insurance coverage, and parts—you’ll love our in-depth “Spectra Gold Breast Pump: 10 Facts on S1, S2, Parts & Insurance” guide

Here’s what you need to know:

✅ Choose the Right Containers

First of all, use clean, BPA-free containers like hard plastic bottles, glass jars, or special breast milk storage bags. Avoid regular disposable bottle liners, as they can leak or break.

✅ Proper Shelf Placement

Instead of placing milk in the fridge door, always store it at the back of the main body of the refrigerator. This area maintains a more consistent temperature, protecting the milk from fluctuations caused by opening and closing the door.

✅ Label and Organize

Additionally, label each container with the date and time of expression. This helps you follow a “first in, first out” method so that no milk goes to waste.

✅ Ideal Temperature & Duration

According to CDC and WHO:

• Temperature: At or below 40°F (4°C)
• Storage Duration: Up to 4 days is safe; ideally use within 3 days for maximum freshness.

Furthermore, never refreeze milk once it has been thawed and stored in the refrigerator.

Storing Breast Milk in the Freezer

Freezing is an excellent way to preserve breast milk for long-term use. When it comes to storing breast milk in the freezer, understanding the difference between a standard freezer and a deep freezer is crucial for maintaining quality and safety. Want the freedom to pump anywhere without being tied to a wall outlet? Don’t miss our Wireless Breast Pump Guide 2025 featuring top hands-free models, pros and cons, and buying tips for new moms.

Deep Freezer vs. Regular Freezer Storage

To begin with, it’s important to distinguish between the two main types of freezers:

• Regular Freezer (within a refrigerator unit):
  In a standard freezer compartment, breast milk can be stored for up to 6 months. However, for best quality, it’s recommended to use it within 3–4 months. Additionally, always place the milk in the back of the freezer, where the temperature stays most stable.
• Deep Freezer (stand-alone freezer at -18°C or 0°F or lower):
  On the other hand, a deep freezer can store breast milk for up to 12 months. Even so, using it within 6 months is considered ideal to retain maximum nutrients and flavor.

How to Freeze Breast Milk Properly

Next, follow these guidelines to ensure safe and effective freezing:

1. Use Freezer-Safe Containers:
   First, choose BPA-free plastic breast milk bags, hard plastic bottles, or glass containers with tight-sealing lids.
2. Leave Space for Expansion:
   Since milk expands as it freezes, leave about 1 inch of space at the top of each container.
3. Label Clearly:
   Furthermore, make sure to write the date (and time, if needed) on each container. Always use the oldest milk first following the “first in, first out” method.
4. Lay Flat to Freeze:
   If you’re using storage bags, freezing them flat not only saves space but also makes thawing much quicker.
5. Avoid the Freezer Door:
   Moreover, never store breast milk in the door section, as it experiences frequent temperature fluctuations. Instead, place milk containers toward the back of the freezer.

Bonus Tip: Portion Smartly

Finally, consider freezing milk in small amounts (2–4 ounces). This way, you’ll reduce waste and make it easier to thaw just what you need for each feed.

Best Bottles for Storing Breast Milk

Choosing the right bottle is essential when it comes to storing breast milk in bottles. The right choice not only ensures your milk stays fresh and safe but also makes feeding and organizing easier. Let’s explore the best options available, along with key considerations like material, storage capacity, labeling, and sterilization. 📚 Looking for more helpful tips on pregnancy, breastfeeding, and baby care? Explore our latest articles on the BabyCarrierPlus Blog and stay informed every step of the way.

Plastic vs. Glass Bottles: Pros and Cons

When selecting bottles for storing breast milk, parents usually choose between plastic and glass. Here’s a comparison to help you decide:

• Plastic Bottles
  Pros:
  • Lightweight and shatterproof – ideal for travel and daycare.
  • Often compatible with most breast pumps.
  • More affordable and widely available.

Cons:

• May wear out faster with repeated sterilization.
• Can absorb odors over time.
• Not all are BPA-free (though most modern brands are).
• Glass Bottles
  Pros:
  • Durable and reusable – they don’t degrade with repeated washing.
  • Free from chemicals like BPA and phthalates.
  • It is easier to sterilize and clean thoroughly.

Cons:

• Heavier and breakable, making them less ideal for transport.
• More expensive upfront.

As a rule of thumb, use glass bottles at home and plastic bottles for on-the-go convenience.

Storage Capacity and Labeling

Next, consider the storage capacity. Bottles usually come in 4 oz or 8 oz sizes:

• 4 oz bottles are perfect for newborn feedings and avoiding waste.
• 8 oz bottles are more suitable as your baby grows and consumes more per feeding.

Additionally, always label bottles with the date and time of expression. This ensures proper rotation and helps prevent the use of expired milk. Many bottles come with writable surfaces or screw-top labels, which are especially helpful for organization. For medically reviewed storage guidelines, visit the CDC’s official page on handling breast milk.

Sterilization Tips

Finally, proper cleaning is crucial. Whether you’re storing breast milk in a bottle made of plastic or glass:

• Wash with hot, soapy water and rinse thoroughly.
• Sterilize regularly—either by boiling for 5 minutes, using a microwave sterilizer, or placing them in the top rack of a dishwasher (if labeled dishwasher-safe).
• Air-dry all parts completely before reassembling to avoid mold or bacteria growth.

Glass Bottles and Mason Jars for Breast Milk Storage

If you’re seeking a reusable, non-toxic, and eco-conscious option, glass bottles for storing breast milk are an excellent choice. Additionally, many parents are now turning to mason jars as a versatile and budget-friendly alternative. However, before you begin storing breast milk in glass bottles or mason jars, it’s essential to understand both the safety considerations and the environmental benefits. For trusted UK-based guidance on how to express and safely store your breast milk, visit the Breastfeeding Network’s detailed guide.

Are Glass Bottles and Mason Jars Safe?

Yes—but with a few precautions.

• Temperature Shock Risk:
  First, it’s important to note that glass is more prone to cracking or breaking when exposed to sudden temperature changes. Therefore, always let breast milk cool in the fridge before transferring it to the freezer, and thaw it gradually—either in the refrigerator or under lukewarm water.
• Sterilization:
  Furthermore, glass is easy to clean and sterilize. You can boil it for 5–10 minutes or use a steam sterilizer. Unlike plastic, glass won’t degrade over time, making it a durable and hygienic long-term option.
• Choose Proper Lids:
  In addition, if you’re storing breast milk in mason jars, be sure to use airtight lids made from food-safe, rust-free materials. Some metal lids may corrode with frequent washing, so it’s best to check the quality before use.
• Storage Safety Tip:
  Lastly, avoid overfilling. Leave about 1 inch of space to accommodate expansion during freezing. Also, consider using smaller jars (4–6 oz) to reduce waste and allow for faster thawing.

Eco-Friendly and Reusable Options

Beyond safety, one of the most compelling reasons for storing breast milk in glass bottles or mason jars is their environmental advantage. Here’s why:

• Reusable:
  For starters, glass containers can be washed and reused countless times without losing quality or releasing harmful chemicals. This makes them a cost-effective choice in the long run.
• Eco-Friendly:
  Moreover, using reusable glass instead of disposable plastic significantly reduces waste and minimizes your carbon footprints, something that’s important to many eco-conscious families.
• Multi-Purpose Use:
  Finally, once your breastfeeding journey ends, these containers can be repurposed for storing homemade baby food, snacks, or pantry items. This versatility adds long-term value to your investment.

Storing Breast Milk While Traveling

Whether you’re heading out for a quick errand or flying across the country, storing breast milk when traveling requires a bit of planning. Fortunately, with the right tools and preparation, you can safely transport breast milk during short outings, road trips, or even long-haul flights. Below are some essential travel breast milk tips to help you keep milk fresh and your baby fed.

Tips for Short Outings

For brief trips—such as running errands or visiting a friend—you’ll need minimal gear, but care is still important:

• Use a small, insulated cooler:
  A compact cooler with reusable ice packs can keep milk cold for up to 24 hours.
• Pre-chill everything:
  To maximize cooling efficiency, chill your breast milk and ice packs before placing them in the cooler.
• Label bottles or bags:
  Just as at home, always label your milk with the date and time of expression.

Tips for Long Road Trips

When taking longer journeys by car, you’ll need a more structured approach.

• Pack a high-quality cooler:
  Opt for a durable cooler that retains cold for 12–24 hours. Hard-sided models offer better insulation than soft-sided ones.
• Bring extra ice packs:
  Since you may not have access to a freezer right away, pack more ice packs than you think you’ll need.
• Keep milk cold, not frozen:
  If you’re not using dry ice, aim to keep breast milk cold during travel rather than frozen. Thawed milk must be used within 24 hours and should not be refrozen.
• Store in small portions:
  Use smaller bottles or bags (2–4 oz) to avoid waste and allow for quick thawing later.

Tips for Flights

Air travel with breast milk is entirely possible, just follow a few extra guidelines:

• TSA and Airport Security:
  According to TSA and most international security agencies, breast milk is allowed through airport security, even in quantities over 3.4 oz. You can also carry a pump and cooler bag.
• Inform security staff:
  Be sure to declare your breast milk and related items (like ice packs and bottles) before screening.
• Use a travel-friendly cooler bag:
  Consider insulated bags specifically designed for breast milk storage. These fit under airplane seats and can keep milk cold throughout the flight.
• Ask for ice if needed:
  Flight attendants can often provide additional ice or cold packs if your current ones begin to warm.

Bonus Tip: Pumping on the Go

Additionally, if you need to pump while traveling, pack a portable breast pump, extra storage bags, and cleaning wipes. Many airports have lactation rooms or nursing pods—check ahead using apps like Mamava.

Temperature Guidelines for Storing Breast Milk

Understanding the correct temperature for storing breast milk is essential for preserving its nutrients and ensuring your baby’s safety. Whether you’re storing milk at room temperature, in the fridge, or in the freezer, each environment has different guidelines and limitations. Below is a quick-reference chart followed by a look at useful tools that can help.

Breast Milk Storage Temperature Chart

Note: Once thawed, breast milk must be used within 24 hours if kept in the refrigerator and should never be refrozen.

Best Gadgets to Monitor Milk Storage Temperature

To ensure proper storage, consider using one or more of the following tools:

• Refrigerator/Freezer Thermometers
  These are inexpensive and help verify that your fridge or freezer is staying within safe limits. Digital models with alarms are especially helpful.
• Smart Bottle Warmers with Cooling Functions
  Some modern warmers double as chillers and have built-in thermostats—great for pumping moms on the go.
• Milk Storage Trackers or Labels
  Time-and-temperature-sensitive labels can indicate if milk has been exposed to unsafe conditions.
• Wireless Temperature Sensors
  For tech-savvy parents, some wireless Bluetooth sensors can be placed inside your cooler bag or fridge and monitored via smartphone apps.

Final Tip

Always store milk in small portions (2–4 oz) to avoid waste and promote faster, safer thawing. And remember—consistent cold temperature is key to maintaining the quality of your stored breast milk.

Rules and Guidelines You Should Follow

When it comes to feeding your baby safely, following the proper rules of storing breast milk is non-negotiable. While pumping and storing milk offers flexibility and convenience, even minor mistakes can lead to wasted milk—or worse, putting your baby’s health at risk. Fortunately, by following established storing breast milk guidelines, you can ensure that every bottle is safe and nutritious.

Do’s and Don’ts of Breast Milk Storage

Let’s begin with some essential do’s and don’ts that every breastfeeding parent should know. These tips will help you avoid common errors and store milk with confidence.

✅ Do’s:

• Always wash your hands before expressing or handling breast milk to prevent contamination.
• Use sterilized containers such as BPA-free bottles or specially designed breast milk storage bags.
• Label each container clearly with the date (and time, if preferred) of expression to ensure proper rotation.
• Store milk in small portions (2–4 oz) to minimize waste and speed up thawing.
• Cool freshly expressed milk in the refrigerator before combining it with already chilled milk.
• Gently swirl (don’t shake) the milk to mix separate fat evenly without damaging nutrients.

❌ Don’ts:

• Do not reheat milk more than once. After warming, use it immediately and discard any leftovers.
• Never refreeze thawed milk. Once it has been thawed, it should be used within 24 hours.
• Avoid mixing warm milk with frozen milk. Only combine milk when both are at the same temperature.
• Don’t relabel old milk. Always keep the original expression date to avoid confusion.
• Never microwave breast milk. It heats unevenly and can destroy valuable antibodies and nutrients.

Summary of CDC and WHO Guidelines

In addition to the above tips, it’s important to understand what the leading health authorities recommend. Both the CDC (Centers for Disease Control and Prevention) and the WHO (World Health Organization) have outlined clear and evidence-based storing breast milk guidelines. Below is a side-by-side comparison:

As shown above, while both organizations share similar recommendations, the WHO tends to allow slightly more flexibility in certain environments, especially in warmer or lower-resource regions.

Final Thoughts

To sum up, the rules of storing breast milk are designed to protect your baby’s health while giving you the convenience to feed on your own schedule. By following these guidelines, using safe storage containers, and paying close attention to temperature and expiration dates, you can confidently build and manage your milk supply.

Pumping and Storing Breast Milk

Whether you’re building a freezer stash or preparing for a day away from your baby, understanding the correct process of pumping and storing breast milk is essential. Safe storage not only preserves nutrients but also prevents contamination, giving you peace of mind with every food.

How to Store Breast Milk Safely After Pumping

Once you’ve finished pumping, it’s important to handle your milk properly. To begin with, hygiene is key:

• First, wash your hands thoroughly before touching any milk storage containers or breast pump parts.
• Next, transfer the milk immediately from the pump bottle into a clean, sterilized container—such as BPA-free plastic or glass bottles or breast milk storage bags.
• Then, label each container clearly with the date and time the milk was expressed. This helps ensure proper rotation, so you always use the oldest milk first.
• In addition, store milk in appropriate portions (2–4 oz per container) to minimize waste and allow for quicker thawing.
• Finally, refrigerate or freeze the milk based on when you plan to use it (see time frames below).

How Long Can You Wait Before Storing?

Right after pumping, you don’t have to refrigerate milk instantly—but it’s still important to act promptly. According to CDC guidelines:

• At room temperature (up to 77°F or 25°C): Breast milk can safely sit out for up to 4 hours.
• Ideally, you should place the milk in the fridge or freezer within 1–2 hours of pumping, especially in warmer conditions.
• If you’re away from home, consider using an insulated cooler bag with ice packs to keep milk cold until you can transfer it to proper storage.

Bonus Tip: Combine with Care

Additionally, if you plan to combine milk from multiple pumping sessions:

• Always cool freshly pumped milk in the refrigerator before adding it to already chilled milk.
• More importantly, never add warm milk directly to frozen milk, as this may partially thaw the frozen portion and increase the risk of bacterial growth.

What Is Expressing Breast Milk?

Expressing means removing milk from your breasts—either by hand, manual pump, or electric pump—when your baby isn’t breastfeeding.

You might need to express if:

• Your baby is premature, unwell, or can’t latch properly.
• You’re away from your baby, like at work or at an appointment.
• Your breasts feel too full, or you want to boost your milk supply.

Expressed milk can be fed using a bottle, syringe, or cup, and helps keep breastfeeding going even during challenges.

Your Breast Milk: What You Should Know

• You can direct breast milk freezer bags by finger, hand drive, or electric pump—hand expressing is easy once you get the hang of it.
• Breast milk naturally fights bacteria, but it still needs to be handled and stored safely.
• Keep milk in the fridge at 4°C or below for best quality. If unsure, assume your fridge may be warmer (5–10°C).
• The best mini fridge for breast milk can be frozen, but freezing may slightly reduce some of its nutrients and immune-boosting properties.

Expressing Breast Milk: Getting Started

• It’s normal to get just a few drops at first practice makes it easier over time.
• Try expressing at different times of day to see what works best for you.

When Should You Express?

• Before birth (36–37 weeks): To collect colostrum if advised. Aim for 10 mins, twice a day.
• First few days: If baby is sleepy or struggles to latch.
• After birth: Express or breastfeed at least 8 times a day (including once at night) to boost supply and comfort.

Hand Expressing Made Easy

Before you begin, wash your hands and prepare a clean, wide-mouthed container like a sterilized jug or pot.

To help milk flow (let-down):

• Relax with music, TV, or a warm drink
• Keep your baby close or look at their photo or clothing
• Warm your deep freezer for breast milk with a shower or warm cloth.
• Gently massage your breasts from the outside in

Steps to express:

1. Build a ‘C’ form with your thumb and touches, 2–3 cm behind the nipple
2. Press gently together in a rhythm
3. Rotate around the breast (like a clock face) to reach all areas
4. Switch between breasts

Moreover, practice helps—everyone finds their own rhythm over time!

Keep Breast Milk Safe with Good Hygiene

• Clean your hands by expressing or managing milk.
• Utilize a sterile, lidded container—avoid reusing the collection jug.
• If possible, use a new container each time. You can mix freshly cooled milk with stored milk from the same day.
• Label containers with your name, date, and time, and store them in a sealed, clean bag or box.
• Store milk in the fridge or freezer right away—place it at the back, away from raw foods.

Additionally, safe storage keeps your milk fresh, and your baby protected!

Six Breast Milk Storage Tips

1. Write the time and date you specified on the label.
2. If at all feasible, give your infant fresh expressed milk.
3. If milk is not used within two days, freeze it.
4. Always use a fresh container; avoid combining stored and fresh milk.
5. Use the oldest milk first; this is known as First In, First Out.
6. If your infant has begun to feed, discard the milk; do not refrigerate or freeze it.

This will ensure your milk stays safe and fresh for your baby!

The Most Beneficial Method for Giving Your Infant Breast Milk Expression

A sterile bottle is the most convenient way to give expressed breast milk. It can be served warm or cold, based on your baby’s preferences. Be patient as your baby adjusts to the bottle; if they are accustomed to breastfeeding, they might want some assistance. If your baby refuses the bottle, try using a small cup or teaspoon instead.

Best Containers for Storing Breast Milk

Choose containers that are food-grade, BPA-free, and non-toxic. Breast milk storage bags designed for freezing are a great option, along with fresh glass or BPA-free elastic bottles with compact lids. Avoid using disposable container liners or regular plastic bags. To prevent waste, store milk in small batches, and discard any leftover milk within one to two hours after feeding.

Storing Pumped Breast Milk at Work or on the Go

Portable Coolers: Keep Milk Fresh Anywhere
Portable Coolers are a lifesaver for storing breast milk while you’re out. They help keep milk at a safe temperature until you can refrigerate or freeze it.

Pumping Tips for Working Moms: Efficient and Easy Solutions
For working moms, using a hands-free pump or scheduling pumping sessions during breaks can make expressing milk easier and more efficient throughout the day.

If you find Postpartum Going Home Outfit: Best Picks for New Moms then click this link.

Transporting Milk Home: Safe and Simple Methods
To transport your milk home safely, use an insulated cooler bag. It will maintain the temperature, ensuring your milk stays fresh until you can store it properly.

Another Storing Breast Milk Video

Watch this helpful video by Aeroflow Breastpumps on Youtube

Conclusion

Properly pumping and storing breast milk is a valuable skill that gives new moms flexibility while ensuring their baby gets safe, nutritious milk—even when they’re apart. As a quick recap:

• Room temperature storage is safe for up to 4 hours.
• Refrigeration extends freshness up to 4 days.
• Freezing is best for longer-term storage—up to 6–12 months depending on your freezer type.
• Glass bottles, plastic containers, and mason jars all have their place, if they’re clean, sealed, and labeled.
• Always follow essential rules of storing breast milk, including no refreezing thawed milk and safe reheating practices.

By following these guidelines, you can build a reliable milk stash, travel with confidence, and feed your baby with peace of mind.

💡 Helpful Tip: Bookmark this guide or share it with fellow moms and parents-to-be—it’s a handy reference you’ll likely return to more than once during your breastfeeding journey.