All Blogs | Your Go-To Breast Milk Storage Guidelines

All Blogs | Your Go-To Breast Milk Storage Guidelines

Your Go-To Breast Milk Storage Guidelines

As a breastfeeding mom, you want to ensure that your little one receives the best nutrition even when direct breastfeeding isn't possible. That's where breast milk storage becomes your superhero sidekick! This comprehensive guide is here to help you navigate the world of breast milk storage with confidence. From choosing the right containers to thawing and cleaning up, we've got you covered. Let's dive into these essential breast milk storage guidelines that will make your life easier while keeping your baby happy and healthy.

The Must-Do's Before You Begin

Before you start your breast milk storage journey, there are a few essential steps you should take to ensure a safe and hygienic process. Let's dive in:

Wash Your Hands: Always begin by washing your hands thoroughly with warm water and soap. This simple step helps prevent the transfer of germs and bacteria to the breast milk and storage containers.

Sterilize Storage Containers: Before using any new containers or breast milk storage equipment, sterilize them properly. You can use boiling water or a steam sterilizer to ensure that the containers are free from any harmful bacteria. If you're reusing containers, wash them in hot, soapy water and rinse them well.

Clean Pumping Equipment: If you're using a breast pump to express milk, it's crucial to clean and sanitize the pumping equipment before and after each use. Follow the manufacturer's instructions for proper cleaning and sterilization of your breast pump parts to maintain hygiene and prevent contamination.

Use BPA-Free Containers: When selecting storage containers, opt for BPA-free options. Bisphenol A (BPA) is a chemical that can leach into breast milk and may have potential health risks. Choosing BPA-free containers ensures that you safely store breast milk and that it remains free from any harmful substances.

Storage Area Preparation: Designate a clean and dedicated space to store breast milk. Ensure that the area is well-ventilated, away from direct sunlight, and maintains a consistent temperature. Keep the storage area clean and organized to minimize the risk of contamination.

Educate Caregivers: If you plan to have others feed your baby with stored breast milk, it's crucial to educate them on proper handling practices and guidelines for storing. Make sure they understand the importance of hygiene, proper thawing techniques, and using milk within the recommended storage durations.

By following these must-do steps, you'll establish a solid foundation for safe and efficient breast milk storage. Maintaining hygiene and proper guidelines for storing are crucial to protect the nutritional quality of your breast milk and ensure your baby's well-being. With these preparations in place, you're all set to embark on your breast milk storage journey with confidence.

The Best Options for Containers to Use

Choosing the right containers for storing your precious breast milk is essential to maintain its quality and ensure convenient usage. Let's explore some fantastic container options that are safe, practical, and user-friendly:

BPA-Free Plastic Bottles: As mentioned previously, BPA-free plastic bottles are a popular choice for storing breast milk. Look for bottles specifically designed for breast milk storage, as they are made from safe materials that won't leach chemicals into the milk. These bottles are lightweight, durable, and often come with measuring markers, making it easy to track the quantity of milk.

Glass Bottles: Glass bottles are another excellent option for breast milk storage. They are more environmentally friendly and can be reused without worry about wear and tear. Mason jars have gained popularity to store milk among breastfeeding moms for their versatility and charm. They have airtight lids, ensuring the fresh breast milk stays safe. Mason jars are suitable for both refrigeration and freezing, and they come in various sizes to accommodate different quantities of breast milk. Plus, they can be reused for other purposes once you're done with breast milk storage.

Breast Milk Storage Bags: Breast milk storage bags are specifically designed for convenient storage. They are made from thick, durable, and BPA-free plastic that can be sealed tightly to prevent leakage and maintain hygiene. These bags are space-efficient and stackable, making them ideal for freezing breast milk. However, be cautious when thawing breast milk in bags, as they may be more prone to leaks or tears.

Silicone Breast Milk Trays: Silicone breast milk trays offer a unique way to store breast milk. These trays have individual compartments that allow you to freeze breast milk in convenient, single-serving portions. Once the milk is frozen, you can transfer the milk cubes into labeled storage bags or containers for easy access. Silicone trays are reusable, easy to clean, and space-saving. A trifecta of benefits that moms love.

Specialized Breast Milk Storage Systems: There are also specialized breast milk storage systems available in the market. These systems often include containers or bags that are designed to fit seamlessly with breast pumps, allowing you to store freshly pumped breast milk directly into the storage container without any transfer. They offer convenience and minimize the risk of spilling freshly pumped breast milk or contamination during the transfer process.

Container Labeling

Labeling your breast milk containers may seem like a simple task, but it plays a vital role in ensuring organization, tracking freshness, and maintaining a clear record of breast milk storage. Here's how to label your containers effectively:

Date and Time: Always include the date and time when you expressed the milk on the label. This helps you keep track of the freshness of the milk and ensures that you use the oldest milk first. Additionally, if you expressed multiple times in a day, noting the time can be helpful to ensure proper rotation.

Quantity: It's a good practice to include the quantity of breast milk in each container. Knowing the amount will help you plan the feeding and avoid any wastage. You can either write the quantity in ounces or milliliters, depending on your preference.

Storage Duration: Consider including the recommended storage duration for the specific storage method you used (refrigeration or freezing). This serves as a helpful reminder to use the milk within the appropriate time frame and helps prevent any waste.

Additional Notes: If you have any special instructions or notes regarding the milk, such as medications taken before pumping, you can include them on the label. This information can be useful for caregivers or healthcare professionals when they handle the milk.

Use Waterproof Labels: To ensure that the labels remain intact and readable throughout the storage period, use waterproof labels or write directly on the containers with a permanent marker. This helps prevent smudging or fading, especially when the containers come into contact with moisture during thawing or refrigeration.

Label Placement: Place the label on the front or side of the container where it is easily visible. This allows for quick identification without having to move or rearrange the containers.

Storage Bag Considerations: If you are using breast milk storage bags, label the bags before filling them with milk. Ensure that the label is securely attached to the bag and won't peel off easily during handling or freezing.

To Freeze or to Refrigerate

Understanding when to freeze or refrigerate breast milk is essential to maintain its freshness and nutritional value. The storage method you choose depends on factors such as your baby's feeding schedule, storage duration, and convenience.

A chart showing proper storage location and temperatures of breastmilk from the CDC


Refrigeration is a suitable method if you plan to use freshly expressed breast milk within a few days. Here are some key points to keep in mind when refrigerating breast milk:

Temperature: Store breast milk in the coldest part of your refrigerator, preferably at a temperature of around 32-39°F (0-4°C). Avoid storing breast milk in the refrigerator door as it is subjected to temperature fluctuations when the door is opened frequently.

Storage Containers: Use clean, BPA-free bottles or storage containers designed specifically for breast milk. Ensure that the containers are tightly sealed to prevent contamination and preserve the milk's quality.

Shelf Life: Freshly expressed breast milk can be stored in the refrigerator for up to 4 days, depending on the storage guidelines recommended by your healthcare provider or breastfeeding expert. However, it's best to use the oldest milk first to maintain freshness. If you’re need more information on breast milk storage, please visit the CDC chart on their website.

Mixing Milk: If you express breast milk at different times of the day, it's important to cool the fresh breast milk before combining it with previously refrigerated breast milk. You can cool the fresh milk in the refrigerator for a short time before adding it to the container of chilled milk.

Avoid Overfilling: Leave some space at the top of the container to allow for expansion when the milk freezes, especially if you plan to transfer the milk to the freezer later.


Freezing breast milk is a convenient option if you want to store larger quantities of milk for an extended period. Here are some important considerations for freezing breast milk:

Temperature: Use the freezer compartment of your refrigerator or a separate chest or upright freezer. Set the temperature at or below 0°F (-18°C) to ensure proper freezing and to maintain the milk's quality.

Storage Containers: Use breast milk storage bags or BPA-free plastic or glass containers specifically designed for freezing breast milk. Because breast milk expands when it’s frozen, make sure the containers are airtight and leak-proof to prevent freezer burn and contamination.

Labeling: Label the containers with the date of expression to keep track of the milk's freshness. It's recommended to use the frozen breast milk within 6-12 months for optimal quality and nutritional value.

Storage Location: Place the containers of breast milk toward the back of the freezer, where the temperature remains the most constant. Avoid storing breast milk near the freezer door or in areas that are prone to temperature fluctuations.

Thawing Considerations: Keep in mind that thawed breast milk should be used within 24 hours and should not be refrozen. Consider storing breast milk in smaller portions and in separate containers to avoid wastage when thawing.

Safely Thawing Breast Milk

Thawing breast milk properly is crucial to preserve its nutritional content and ensure your baby's safety. Here are some guidelines for safely thawing breast milk:

Refrigerator Thawing

Thawing breast milk in the refrigerator is the safest method as it allows for a slow and controlled thawing process. Follow these steps for refrigerator thawing:

  1. Retrieve the Frozen Breast Milk: Take the container of frozen breast milk out of the freezer and place it in the refrigerator. Ensure that the container is tightly sealed to prevent any leakage.
  2. Thawing Time: The thawing process for previously frozen milk in the refrigerator can take approximately 12 to 24 hours, depending on the quantity and thickness of the milk. Plan ahead to allow enough time to thaw frozen breast milk completely before use.
  3. Gentle Swirling: Once the breast milk is thawed, gently swirl the container to mix any separated cream back into the milk. Avoid shaking vigorously as it may break down some of the beneficial components of the milk.
  4. Check Temperature: Before feeding your baby, check the temperature of the thawed breast milk. It should feel lukewarm or at room temperature. If needed, you can warm it slightly by placing the container in a bowl of warm water for a few minutes.

Warm Water Bath Thawing

If you need to thaw breast milk more quickly, you can use a warm water bath. Follow these steps for warm water bath thawing:

  1. Prepare a Bowl or Basin: Fill a clean bowl or basin with warm water. Ensure that the water is warm but not hot, around 98°F (37°C). Avoid using boiling water or microwaving breast milk for thawing.
  2. Submerge the Container: Place the sealed container of frozen breast milk into the warm water bath, making sure the water level does not exceed the lid of the container. Do not open the container during thawing to maintain the milk's sterility.
  3. Monitor and Rotate: Monitor the water temperature and rotate the container occasionally to ensure even thawing. Adding more warm water as needed can help maintain the desired temperature.
  4. Test Temperature: After thawing, test the temperature of the warm breast milk by placing a few drops on your inner wrist. It should feel lukewarm or at room temperature before feeding your baby.

Thawing in Bottle Warmers

If you have a bottle warmer, you can use it to thaw breast milk quickly and conveniently. Follow the manufacturer's instructions for proper usage and set the warmer to the appropriate setting for thawing breast milk. Always test the thawed milk temperature before feeding to ensure it is safe for your baby.

What To Avoid

Microwaving breast milk is not recommended as it can cause uneven heating and destroy valuable nutrients. It may also create hot spots that can burn your baby's mouth. Additionally, microwaving can break down the milk's protective properties and increase the risk of bacterial growth. Remember, once breast milk is thawed, it should be used within 24 hours. Never refreeze breast milk. Refreezing thawed breast milk, as it can affect its quality and safety.

Additionally, before you store away your breast milk, you want to be sure that your milk supply is ready to be consumed by your baby. If you’re a breastfeeding mama who likes to enjoy an occasional alcoholic beverage during a celebration or social gathering, try using Milkscreen to detect any alcohol before pumping or expressing milk to be stored away.

Cleaning Up

Maintaining cleanliness throughout your breast milk storage journey is crucial to ensure the health and well-being of your baby. Here are some important tips for cleaning up:

Clean Hands: Before handling breast milk storage containers, always wash your hands thoroughly with warm water and soap. This helps prevent the transfer of germs and bacteria to the milk and containers.

Cleaning Containers: After each use, wash the breast milk storage containers, whether bottles, bags, or jars, in hot, soapy water. Use a bottle brush or nipple brush to reach all the corners and crevices. Rinse them well with clean water to remove any soap residue.

Sterilizing Containers: It is recommended to sterilize the breast milk storage containers before the first use or when using new containers. You can sterilize them by boiling them in water for 5-10 minutes or using a steam sterilizer. Follow the manufacturer's instructions for the specific sterilization method you choose.

Cleaning Pumping Equipment: If you are using a breast pump, clean and sanitize the pump parts after each use. Disassemble the parts and wash them in warm, soapy water. Rinse them thoroughly and allow them to air dry on a clean, dry surface. Some pump parts may also be dishwasher-safe. Refer to the manufacturer's instructions for the specific cleaning recommendations for your pump.

Storage Area Cleanup: Regularly clean and sanitize the area where you store your breast milk containers and pumping equipment. Wipe down the surfaces with a clean, damp cloth or disinfectant wipes to remove any potential bacteria or spills.

Storing in a Clean Environment: When transferring the expressed breast milk into storage containers, make sure the area is clean and free from any potential contaminants. Avoid transferring milk near open windows, pets, or areas where food is being prepared.

Drying Properly: After washing the containers and pump parts, allow them to air dry thoroughly on a clean drying rack or towel. Avoid using cloth towels to dry them, as they may introduce lint or bacteria.

Regular Cleaning Schedule: Establish a regular cleaning schedule for your breast milk storage containers and pumping equipment. Consistent cleaning practices ensure a hygienic environment and minimize the risk of contamination.

Inspecting for Damage: Regularly inspect your breast milk storage containers for any signs of wear, cracks, or damage. Replace any containers that are no longer in good condition to ensure the integrity and safety of the breast milk.

By following these cleaning practices, you can maintain a clean and safe environment for handling and storing breast milk. Proper cleaning helps prevent the growth of bacteria and ensures that your baby receives the highest quality and safest milk possible. Always refer to the manufacturer's instructions for specific cleaning and sterilization recommendations for your breast milk storage containers and pumping equipment.

Are You Prepared For Your Storage Journey?

A woman cradles her baby as she breastfeeds
We hope this comprehensive guide was helpful for  your breast milk storage journey. It can seem daunting at first, but remember that trial and error is okay! You’re doing an amazing job raising your little one. Learning these tips and tricks simply gives you more tools in your tool belt. If you need additional information about storing your breast milk safely, visit the website to hear more about handling breast milk.