Thanks, Science: Yet Another Reason Storing Milk in Glass is Better Than Plastic

During Mason Bottle’s Kickstarter campaign, we got some great press and that press generated a lot of discussion about bottles and feeding. So for the next several blog posts, we’d like to respond to some of the milk myths and mysteries parents have been wondering about.    
First up: Has anyone ever heard the suggestion that you shouldn’t use glass bottles with breast milk? We had not. (And don’t worry, it’s not true.) But apparently, until this idea was debunked by further research, this was a real recommendation people used to make. Amazing, isn’t it?
Here’s how this topic came up and here’s the science:
Among the 1/2 million views Mason Bottle's article in Popsugar received, one mom commented, “I thought you couldn’t use glass bottles with breastmilk.” Of course, we had no idea this was debateable, but then another mom chimed in: “You’re not supposed to because antibodies and/or nutrients cling to the glass. It’s been a long time since I was breastfeeding, but they did used to say not to put breast milk in glass.” 
Well, here's the science: It turns out that there was a study that came out many years ago that showed beneficial antibodies called leukocytes clung to the sides of glass containers. However, subsequent research has shown that breast milk stored in glass actually contains more antibodies than breast milk stored in plastic.  
Without further research, it is unclear exactly why breast milk stored in glass containers contains more antibodies. But whatever the reason, we are thankful to know that glass is actually better for storing breast milk that plastic!
We are also thankful for the wonders of social media, without which we would never have known that this might be a concern for some parents. If you want to know more about this topic, visit Ask Dr. Sears for the long version and for lots of other best practices when it comes to taking care of breast milk.

1 comment

  • andy

    I am also agree with your point that Storing Milk in Glass is Better Than Plastic.
    I am also using glass bottles to store milk.
    Thanks for sharing.

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@faustisland just bought a pack of Mason Bottle Silicone Nipples, and then combined one with a classic blue mason jar she had at home. Extra adorable! uses Mason Bottle Silicone Sleeves to make toddler training cups for her big girls.

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Made in the USA

"I wish I knew about these before I had my shower, and avoiding all the plastic bottles I ended up with. They will also make great glasses after bottle use is over. Also happy to see the Made in the USA mark on the product as well." -Cathryn


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"The next best thing to breastfeeding and the world's best shower gift! I love that I will never again have to buy a baby bottle because I already have tons of mason jars and they are so easy to clean. Our little guy loves his bottle!" -Susan


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"The nipples are very wide, like on an actual breast, and our daughter really liked them. Early on, she would suck really hard on the other nipples and make a very strange noise. As soon as we changed over to these her feeding became effortless." -Denielle

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