How To Store Breastmilk In Mason Jars

Calling all mamas! Are you tired of all the waste a new baby can bring? Want to save money and trash all at the same time?? We've got your back!

One super easy and inexpensive way to reduce your baby waste is to store your breastmilk in mason jars!

Why mason jars?

1. They're made of glass so they're durable and when you heat milk, nasty chemicals won't leak into the milk like with plastic containers!

2. They're super affordable! A 12 pack of jars is $7.98 at your local Walmart! I work from home so a 12 pack is all I need for my baby. You may need more or less depending on what works for your family!

3. You can use them for breastmilk and then transition them into baby food jars if you choose to make your own baby food!

4. Did I say reusable? No more trash! This saves you money AND what you're adding to the landfill! You can throw them into the dishwasher or hand wash them and air dry with your pump parts!

Now that I've convinced you that storing breastmilk in mason jars is the best baby eco swap ever, lets talk about how to properly store this milk.


  1. 4 oz mason jars. This seems to be a great size for breastmilk because younger babies usually only need about 4 oz in a feeding, and if they want more it's super easy to thaw more!

  2. Optional: Plastic lids. You do not need to buy separate lids, however I opted to get these plastic ones because I was nervous about rust on the metal lids that come with the jars.

  3. Breastmilk!

**Check out Mason Bottle's website. They have TONS of products to get you started on your mason jar feeding journey. They are a little more expensive but they make the switch so easy!

How to:

  1. Pour expressed milk into mason jar.

  2. Put the lid on.

  3. Label with date.

  4. Store in refrigerator (up to 4 days) or freezer (up to 12 months).

That's it!

To thaw breastmilk in a mason jar you can either put it in the fridge for over night, leave it on counter for a few hours, or place it in warm water. Just like with your breastmilk bags!

You can then either get nipples that fit on your mason jars from the Mason Bottle website OR you can pour the milk into the bottles you already have!

If you're more of a visual learner, we have a video to show you how to store your milk properly!

Happy pumping! :)

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