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If you’re navigating the world of pumping, you probably already know that finding the right setup can make all the difference. From the right pump to the right flange size, each piece matters. This is especially true when it comes to your comfort and milk output.
One key factor that’s often misunderstood? Flange size. So many mamas start off using the default size that comes with their pump, only to find themselves struggling with clogged milk ducts, discomfort, or low output. That’s because flange size isn’t one-size-fits-all, and using the wrong size can cause more issues than you think! So many mamas have NEVER been told what their nipples are supposed to look like while pumping.
Until now.
How to Measure Flange Size Properly
Before we dive into how you can measure and determine your flange size, you need to understand a few things. Below, we’ll take a look at what a flange is and how the size affects milk output. This is your go-to resource to finally get your flange sizing right so you can pump comfortably and confidently.
What Is A Breast Pump Flange?
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A breast pump flange (also known as a breast shield) is the part of the pump that fits over your nipple and areola. As your pump runs, it creates suction that draws your nipple into the tunnel of the flange to express milk.
Flanges come in a variety of sizes, ranging from 15mm up to 36mm, because every body is different. I find that many pumps come with a standard 24mm which doesn’t really allow for inclusivity. In fact, most moms need a smaller flange than they’re originally given!
I get it though, pumping can be such unchartered territory for so many new mamas. This is exactly why I made The Ultimate Pumping Course! All I want is to help every mom feel informed and stress-free on their journey from the first feed to the last. I recommend this to every mama who needs support on their journey.
Does Flange Size Affect Milk Output?
Yes! It absolutely does. When the flange is too big, it pulls too much of the areola into the flange tunnel, leading to friction, poor stimulation, and even nipple irritation which can all reduce milk flow. On the flip side, if the flange is too small, it can restrict nipple movement and compress ducts, making it hard for your milk to flow.
Getting the right fit ensures your nipple moves freely in the tunnel without rubbing, helping trigger a better letdown and a more complete emptying of your breast. This is obviously very important for maintaining a consistent milk supply or boosting it.
How to Measure For Flange Size
Measure your nipple diameter.
Download my printable nipple sizing guide to measure your nipple (not your areola), when it’s stimulated, like it would be during pumping. When you download it, you’ll find full instructions to guide you, with plenty of sizes to try and a measuring tape at the bottom. If you need more help, please reach out to our friendly lactation consultants.
Don’t assume the standard size is right.
The flange that came with your pump is definitely a starting point, but it’s not a one-size-fits-all solution. In fact, like I said above, most women fall outside of the standard 24mm range. You could need something as small as 13mm or as large as 30mm, and this can still change over time due to hormonal shifts, engorgement, and the frequency of pumping.
Observe your nipple during pumping.
When pumping, look for these signs of a good fit:
- Pumping feels smooth and comfortable.
- Your nipple is able to freely move in and out of the tunnel.
- There’s no pinching or rubbing.
- Only a small amount of the areola is pulled in.
If at any time your nipple feels sore, turns white, or gets stuck in the tunnel, the size may be off.
Monitor your milk output and comfort.
A properly fitting flange should make pumping easier, faster, and more comfortable not more frustrating. If you’re not emptying well, feeling sore, or getting clogs, try testing a different size. Even 1mm can make a big difference.
Using the correct flange size can totally change your pumping experience.
There’s no universal flange size that works for everyone. Just like we all have different shoe sizes, your nipple size is unique too, and finding the right flange size is crucial for an effective and pain-free pumping journey. Give yourself plenty of permission to experiment and adjust. Your perfect fit is out there, and once you find it, you’ll be amazed at how much more comfortable and productive it is.
Hang in there, take a deep breath, and try some positive affirmations to help you through this journey. If you’re still at the very start of your pumping journey and not sure which pump is right for your needs, don’t miss my post on how to choose the right breast pump. It breaks down everything you need to know to make an informed choice.
Remember, you've got this, mama!
