How Long Can Breast Milk Stay In Bottle Warmer? All You Should Know

How Long Can Breast Milk Stay In Bottle Warmer? All You Should Know

Pumping milk takes time, so mothers tend to pump more than the required amount at one time. The controversial issue here is whether you can store it for subsequent use. The good news is yes!

So, how long can breast milk stay in bottle warmer? The short answer is four hours. After this time, you should store or throw it. 

Let’s dig into this article to get a detailed explanation and some valuable tips to keep your baby’s food fresh longer! 

How Long Can Breast Milk Stay In Bottle Warmer? 

The allotted time is 4 hours, but how long you can store your baby food also depends on the conditions you leave it. 

In The Cooler

Many mothers use an insulated cooler to bring their pumped milk to the workplace or even when traveling. According to the CDC, it can be fresh when cooler for approximately 24 hours.

All you need to do is ensure the cooler remains sealed for the duration of your journey. Also, remember to put your baby’s food in the fridge or the freezer right after you arrive at your desired location.

In The Fridge

It can be good in the fridge for about four days, but you must set your fridge to 40 degrees Fahrenheit or lower. 

Keep in mind that it should be kept in the back of the fridge, where it’ll be the coldest. It would be best never to put it in the fridge door because temperature variations can cause it to deteriorate.

However, the frozen one generally lasts 24 hours inside the refrigerator.

In The Freezer

Although it can be stored in the freezer for 12 months, its quality degrades over time. To get the finest quality and flavor, utilize it within 3 – 6 months. Ensure that the temperature is at or below 0 degrees Fahrenheit.

On The Counter

You can leave pumped or freshly expressed milk on the counter for around 4 hours at about 77 degrees Fahrenheit or below. 

You should use it whenever possible because it has higher nutrients and immune-boosting properties than a frozen one. 

You can leave your baby’s food for such a long time at room temperature because this baby food is a living substance that contains antibacterial qualities that inhibit bacteria from growing. 

That said, no matter where you store your baby’s food, you had better use leftover one within 2 hours after your baby’s last feeding. 

Pack it in the BPA-free bags

How To Store Breast Milk? 

Typically, you can store it in the fridge or the freezer. Follow these two valuable and practical ways below to keep its best quality: 

In The Fridge

  • After you’ve expressed or pumped, it’s better to put it in the fridge as quickly as possible. 
  • Store it in clean bottles or BPA-free storage bags
  • If the milk you want to add has been cooled in the refrigerator earlier, you can put a tiny amount of pumped one in the same container. 
  • Do not incorporate body-temperature milk with already boiled one.
  • It will help if you put it in the refrigerator’s coldest region, such as at the rear or above the veggie division on the shelf. 

In The Freezer

  • As soon as you’ve expressed your milk, freeze it.
  • If the milk needs to store has been chilled in the freezer previously, you can add it to the preexisting frozen one.
  • You should never mix frozen milk with body-temperature one. 
  • It would be best to store it in less than 60 (ml) quantities for minimal wastage and easy thawing.
  • Choose the proper storage containers. At freezing temperatures, some may crack.
  • Because it swells when frozen, pour containers or bags not over three-quarters full.
  • Store in the most consistent position.

Store it in the fridge or freezer

How To Warm Breast Milk? 

It’s not compulsory to heat it, but a warm one will soothe your baby while feeding. Apply one of the following methods: 

From The Fridge

  • Take it out from the refrigerator and place it in a separate container.
  • Use a microwave or tea kettle to heat the water, and then pour hot water into a bowl or mug. 
  • Put the sealed bottle or bag into the bowl with hot water. 
  • Leave it for around 1 or 2 minutes. 
  • If the fat has split, swirl it to incorporate it.

Note: Check the warmth of your milk before giving it to your child in a container.

From The Freezer

Before warming frozen milk, you need to thaw it first and apply the same steps.  If you are unsure how to defrost it properly, consider the following tips: 

  • Take it out of the freezer and leave it in the fridge to thaw naturally overnight. 
  • Never thaw it at room temperature.
  • Don’t thaw it in boiling water or using microwaves, as these may damage its protective and nutritional properties. 
  • Once thawed, you should never put it back in the freezer.

Don’t remove the lid of the bottles.

If you want to know more about methods to thaw your frozen baby food, you can watch this video: 

How To Tell If Breast Milk Goes Bad? 

It’s not too hard to notice spoiled milk. When you see one of the following signs, your baby’s food has gone bad: 

Sour Taste

Taste it if you are worried, and the other indicators aren’t evident. It will have a distinct sour flavor once it has gone spoiled.


Like cow milk, sour odor and curdling are the most visible signs of spoilage. 

Though this milk separates, it should quickly combine again. If it doesn’t, there’s a chance it’ll not be good any longer.

Soapy Smell

Stored milk often has a soapy-like smell because of excess lipase. It is still safe for your kid to consume, but some babies may reject it due to its unpleasant taste. 

Check its quality via taste, smell, and texture.


Can You Use Previously Heated Milk?

You should discard any remaining baby food after two hours. This keeps it from spoiling or being contaminated by bacteria in the atmosphere.

Can You Microwave Breast Milk?

The short answer is no! Microwaving destroys nutrients and creates hot patches that may burn your baby’s lips.

Does Heating Change Breast Milk?

No, but overheating may damage immunological elements of high value! High temperature may reduce its anti-infective properties. 

Frozen bags

In A Nutshell

Now you know when your milk can be fresh after being pumped or expressed. How long can breast milk stay in bottle warmer? All in all, around four hours. 

Remember to refrigerate or freeze it as soon as possible to retain its nutrients and anti-infective properties for the next consumption. Thanks for taking your time reading this post!

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