Why Can’t You Store Breast Milk in Bottles With Nipples? [3 Reasons]

Last year, when I was preparing to become a mother, I had to face many new questions and problems. One of the most important was safely storing breast milk. Friends and family gave different advice, but I decided to turn to professionals – doctors and breastfeeding specialists.

I spent long hours researching information about the correct way to store breast milk and freeze homemade baby food. I learned that breast milk can be stored in the refrigerator for up to 4 days and in the freezer for up to 6 months. I learned how to defrost milk correctly and use special containers for storing it.

Thanks to the knowledge I gained, I was confident that my baby would always have access to fresh breast milk and healthy food. I felt confident and calm before the upcoming birth, knowing that I could provide everything my child needed.

Now I will share with you my experience in this article, perhaps future mothers will find it useful.

feeding bottle for baby

Methods for storing breast milk

When I first became a mother, one of the most important issues for me was conserving breast milk. I knew that this was valuable nutrition for my child, and I wanted him to receive it even in my absence.

I started looking for information on how to safely store breast milk in bottles and was surprised to learn that several methods and rules need to be followed. I learned that breast milk can be refrigerated, frozen (frozen milk), or even canned.

I started practicing these methods and made sure that my baby continued to receive all the necessary nutrients. I felt confident knowing that I would have a supply of breast milk for my baby if I was away.

So, with information about how to safely store breast milk, I was able to meet my baby’s needs and make sure he was getting everything he needed to be healthy and thriving.

I have discovered various methods for storing breast milk in bottles and containers that can assist in preserving its nutritional value and freshness.

When my breast milk expands I started researching different ways to store breast milk and it became clear to me that it could be done in containers, and bottles, as well as being stored in the refrigerator and freezer.

The containers were convenient for storing small amounts of milk or breast milk storage bags, especially for mixing with feed additives or for night feedings. I used these containers for convenience and storage organization.

On the other hand, the bottles were convenient for storing large volumes of milk that I could freeze for future use. Freezing allowed me to accumulate a supply of milk that could be useful in case of shortage or unforeseen circumstances.

With information on ways to store breast milk in containers and bottles in the refrigerator and freezer, I felt confident in storing nutritious milk for my baby and had peace of mind knowing he always had access to the nutrients he needed.

Breast milk storage containers

I understood that breastfeeding was very important for my baby, and I wanted to find the best way to preserve its valuable properties.

I learned about the different types of breast milk containers. This information interested me, and I decided to study this issue in more detail.

I learned that there are special containers for storing breast milk made from safe and environmentally friendly materials. They have convenient lids that close tightly, preventing milk from spilling and maintaining its freshness.

I also learned that there are different sizes of plastic containers, from small to large, allowing you to choose the best size to store the amount of milk you need. Some containers were even labeled for convenience and ease of use.

Thanks to new knowledge about different types of containers for storing breast milk, I was able to choose the most convenient and functional option for myself.

Varieties of containers for refrigerated milk storage

  1. Plastic containers.
  2. Reusable freezer bags for breast milk or homemade baby food are convenient for freezing and storage.
  3. Silicone containers are both food-safe and practical for transferring and storing breast milk or freeze homemade baby food.
  4. Special wide-neck bottle containers are convenient and can be warmed in hot water for feeding.
  5. Dedicated bags designed for storing breast milk are practical for transportation and storage purposes.
  6. Ice packs.

Can I store breast milk safely in glass bottles?

I have discovered that there are advantages and disadvantages to using glass bottles for storing breast milk.


  • Glass is an inert material that does not contain harmful chemicals.
  • Glass bottles are easy to clean and disinfect, which is important for the safety of the product.
  • Glass can be recycled, making it a more environmentally friendly material than plastic.
  • Glass bottles to store milk can last a long time without losing their quality if used correctly.


  • Glass is more fragile than plastic, so there is a risk of the bottle breaking if dropped or misused.
  • Glass is heavier than plastic, which can be awkward to carry or use outside the home.

I tried storing freshly expressed breast milk in a glass bottle and let me tell you that I liked it. It is convenient to store and wash the bottles themselves, so I recommend this utensil for use.

Why can’t you store breast milk in bottles with nipples?

One issue I observed is the restriction on storing breast milk in bottles with nipples. Despite their convenience for feeding, upon further research on why can’t you store breast milk in bottles with nipples due to the following reasons:

feeding bottle for baby

Hygiene issues. Bottle nipples for storing breast milk are harder to sanitize and clean, which can promote bacterial growth. Additionally, bottles with nipples used for storing breast milk might have tiny pores where milk residue can accumulate.

Contamination risk. By using bottles with nipples for breast milk storage, there is a chance of dust particles and bacteria entering the container and contaminating the milk.

Storage effectiveness with bottles with nipples. Using bottles with nipples may lead to difficulties in correctly storing milk – the nipple could disrupt the bottle seal, compromising the product’s safety.

This is why can’t you store breast milk in bottles with nipples. Consequently, I opted to store breast milk in dedicated containers without nipples to preserve its quality and nutritional value for my baby.

The presence of bacteria and contaminants in breast milk stored

When I became a mother, one day while feeding with disposable milk bottles with nipples, the baby’s mouth was closed and I could not do anything about it. I began to wonder what could have gone wrong and decided to look into the matter further.

Having discovered that the milk might be contaminated or harboring bacteria, I watched workshops by breastfeeding experts that explained how to properly collect, store, and use breast milk in bottles with nipples.

I discovered the importance of maintaining strict hygiene when handling bottles with nipples, which includes washing hands before collection, using clean bottles with nipples, and storing the milk at the appropriate temperature.

I also found out that milk can risk contamination if the storage containers for breast milk are not sufficiently clean or if the milk is stored at an improper temperature.

feeding bottle for baby
image source: canva.com

What is the source of bacteria in breast milk stored in bottles?

I learned that the presence of bacteria in breast milk in bottles and contaminants in breast milk stored in bottles can result from inadequate storage conditions and lack of hygiene during the milk collection and storage process.

Improper hygiene

Insufficient hand washing before collecting milk, using unclean containers, or poor hygiene when collecting milk can lead to bacterial contamination of the breast milk in bottles.

Inappropriate storage conditions of breast milk in bottles

Stored breast milk in bottles at temperatures that are not sufficiently cold or hot may promote bacterial growth in the stored milk. Additionally, extended storage of breast milk in bottles at room temperature can result in contamination.

Incorrect use of containers

Using storage containers that are not designed for this purpose or using devices such as nipple bottles to store milk can contribute to contamination and contamination of the milk.

Insufficient packaging tightness

If milk containers do not provide airtight storage, this can allow air and bacteria to enter the milk, causing contamination.

I advise you to practice good hygiene when collecting milk, use special storage containers, follow storage temperature recommendations and carefully monitor the condition of the milk to ensure safety and nutritional value for your baby.

How to wash breast milk containers and bottles with nipples?

To maintain safe and hygienic storage of breast milk, I consistently wash containers following this procedure:

  1. Before starting the washing process, I wash my hands thoroughly with soap and hot water to avoid getting bacteria on the containers or bottles with nipples.
  2. I separate containers or bottles with nipples used for storing milk from other utensils and foods to avoid contamination.
  3. Wet the containers or bottles with nipples in warm water and a mild detergent. I do not use aggressive detergents to avoid chemical residues on containers.
  4. Wash each container thoroughly, inside and out, with a soft sponge or brush, paying special attention to hard-to-reach places where milk or dirt may accumulate.
  5. I rinse the containers or bottles with nipples under warm running water to remove any remaining detergent.
  6. For additional disinfection of containers or bottles with nipples, especially if they have been stored for a long time or reused, you can use special disinfectants designed for children’s dishes.
  7. Dry containers on a clean towel or air dry, avoiding paper towels or rags, which may contain germs.

Sterilization of containers and bottles with nipples

Sterilizing bottles with nipples and breast milk containers for storing breast milk plays an important role in ensuring safe and hygienic feeding for your baby. Here’s how I usually carry out the sterilization process of feeding bottles:

  1. Before starting sterilization, I disassemble bottles with bottle nipple and containers into their parts (lids, bodies) to ensure access to the sterilizing solution in all corners.
  2. Then I place all parts of the plastic bottles and containers in a special sterilizer for baby supplies or in a pan of boiling water.
  3. If I use a sterilizer, turn it on and wait for the sterilization cycle to complete by the operating instructions.
  4. If I am sterilizing plastic bottles and containers in a saucepan, I immerse them in boiling water and keep them on fire for several minutes (about 5-10 minutes).
  5. After completing the sterilization process, I remove feeding bottles and containers using special tongs or gloves to avoid contact with hot surfaces.
  6. Leave bottles with nipples and containers to dry on a clean towel or air dry in a dry and clean place before using them.

Expressing breast milk and freezing

When I decide to express breast milk for storage and freezing, I follow a specific process to ensure the nutrients are preserved and the product is safe for my baby. Here’s what my process roughly looks like:

  1. Before pumping with a breast pump, I wash my hands thoroughly with soap and hot water to avoid introducing bacteria into the milk.
  2. I prepare clean, sterile dishes, such as breast pump or special containers for storing milk.
  3. In conditions where I am comfortable, I begin to freshly expressed milk using a manual expression pump or an electric expression machine.
  4. The collected expressed breast milk should be carefully poured from the expression container into prepared sterile containers. For easy storage, I can divide the milk into small portions.
  5. I seal the containers with lids and sign them with the date of pumping so that I know how much time has passed since collection.
  6. Place the breast milk containers in the freezer, ensuring they are positioned on the rack for uniform freezing. Breast milk can be stored in the freezer for approximately six months.
  7. When preparing to use thawing breast milk, I thaw it gradually and with caution by placing the container in the refrigerator or warm water. I keep thaw breast milk in the refrigerator for no more than 24 hours to ensure its safety for consumption.

How to properly defrost and warm breast milk?

When I need to defrost and warm breast milk to feed my baby, I follow a specific process that goes something like this:

  1. Before thawing, I check the date of collection and place a container of stored breast milk in the refrigerator to defrost slowly. Typically, the milk is thawed within 24 hours in the refrigerator.
  2. In situations where rapid thawing is required, I can place the breast milk container in warm water. It is crucial to avoid using hot water or the microwave for defrosting to prevent nutrient damage.
  3. Once defrosted, I gently stir the milk to ensure even temperature and fat distribution.
  4. To warm defrosted milk, I use a water or steam bath. Having placed the container with milk in the bathhouse, I slowly heat it to room temperature or the baby’s body temperature (about 37 degrees Celsius).
  5. Before I start feeding, I check the temperature of the milk on the inside of my wrist or lip to make sure it is comfortable for the baby.
  6. After feeding, it is best to throw leftover milk away as germs may form there.
  7. Remember that heated milk should be used immediately and not overheated to avoid loss of nutrients.

By adhering to the guidelines for thawing and heating breast milk, I ensure a safe and nourishing diet for my baby while maintaining all of its beneficial properties.

The importance of breast milk for a baby

I learned about the importance of breastfeeding for a baby even before I became a mother. Throughout my pregnancy, I read a lot of materials and talked with doctors to be prepared for what awaited me after the birth of the child.

In addition, I learned that breastfeeding promotes a closer bond between mother and child, strengthens the baby’s immune system, and promotes the proper development of its organs and tissues. This knowledge served as an additional incentive for me not to give up breastfeeding.

Thus, I came to understand that breastfeeding is not just a method of nourishing a baby, but also a crucial aspect of their development. Proper storage of breast milk in bottles also plays a significant role in a child’s growth. However, you can store breast milk in specialized breast milk storage bags.

feeding a baby

What are the do’s and don’ts of storing breast milk?

When presented with the task of storing fresh breast milk, I delved into researching the best practices for preserving its nutritional content.

Subsequently, I discovered that breast milk can be safely stored in breast milk storage bags or breast milk storage bottles in the refrigerator, freezer, or specialized containers.

It is imperative to refrain from using bottles with nipples for storage to prevent nutrient degradation and contamination risks.

Maintaining proper hand hygiene and ensuring the cleanliness of containers is crucial in preventing bacterial contamination during milk collection and storage.

This understanding of breast milk storage enabled me to establish a system that maximized the benefits for my baby.

Additionally, it’s important to store breast milk to note that previously frozen breast milk should not be refrozen.

When reheating frozen breast milk, it is advisable to thaw it in the refrigerator or under warm water. Leftover milk that has been previously frozen milk should be discarded, as refreeze breast milk is not recommended.


Is it OK to store breast milk in baby bottles?

Upon discovering that breast milk can be stored in baby bottles, I was pleasantly surprised. This revelation was one of the milestones that enhanced convenience and simplicity in caring for a newborn. I learned that specialized baby bottles for storing breast milk are not only suitable for feeding infants but also for preserving the essential nutrients in breast milk.

Adhering to the guidelines for preparing and storing breast milk was crucial to ensure that the baby receives the full benefits of this valuable product.

Can you store breast milk in bottles with teats?

Upon discovering that breast milk should not be stored in bottles with nipples, I found it somewhat perplexing. I questioned why these bottles, typically used for feeding babies, were not suitable for breast milk storage.


Although using a bottle with a nipple may seem convenient for storing breast milk, I recommend against it due to the potential risks it poses to the babythat is why can’t you store breast milk in bottles with nipples. 

Proper storage is essential to preserve the nutritional value of breast milk and safeguard the infant’s health. I have learned that correctly store breast milk maintains essential nutrients that contribute to the baby’s well-being and growth.

By store breast milk properly, you can preserve the essential vitamins, minerals, and antibodies it contains.

This is why it is not recommended to store breast milk in bottles with nipples. The main purpose of correct storage is to prevent bacterial and germ contamination.

It is advisable to use designated containers in both the refrigerator and freezer for storing breast milk.

When thawing milk, it is recommended to gently swirl it, preferably using a breast milk stick. Properly stored milk ensures that the baby feeds effectively with an open baby’s mouth.

When transporting breast milk in bottles, it is crucial to follow breast milk storage guidelines. It is suggested to use a portable refrigerator for transporting breast milk.

Another guide you might like: check how often should you replace baby bottles.

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