By selecting the correct breast pump flange size, you may increase your comfort and milk output considerably. A good fit enhances the efficiency of your pumping sessions while preventing discomfort, nipple injury, and low supply. Many breastfed mothers are often unaware of the considerable impact the flange (also referred to as a breast shield) can have on their pumping performance, and default sizes often do not fit all women.
Flange size is as important as suction strength or pumping rhythm, whether using an electric or manual pump. Explore various breast pump flange sizes from trusted brands like Momcozy, designed to support each step of your nursing journey, to find the precise fit for a better, adjusted pumping experience.
Below, we explain all you need to know, including how to measure your nipple size and when to adjust the size of your flange.
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Why Flange Size Matters
Using the wrong sized flange is the issue that causes many pumping problems. Having the right fit directly affects the flow and supply of milk, and overall breast health; it is not solely for comfort.
This is why flange size matters:
- Efficiency: The correct flange allows your pump to create constant suction like the natural latch of a baby, which enhances milk let-down and allows for greater milk removal.
- Comfort: If flanges are not kept in good condition they can cause friction, discomfort, or swelling of the nipples, which results in horrible and disheartening pumping sessions.
- Protection of the Nipple and Areola: Small flanges can pinch or restrict the nipple while large flanges may pull too much of the areola (nipple foundation) tissue into the tunnel, both terrible scenarios lead to pain, decreased milk flow, and fissures.
- Preventing Blocked Ducts: Not having a fit can make it difficult for your breast tissue to be emptied enough; their increased chance of mastitis, engorgement, or blocked ducts will happen if emptying is ineffective or inefficient.
Quick Tip: Since every body is different, there can be a large natural variation in nipple size and it may even change while nursing.
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How to Measure Your Nipple at Home
The first step in figuring out which breast pump flange size is right for you is to measure your nipple diameter (not your areola). You can do this simple, step-by-step measurement at home:
- Gather your supplies: you will need either a ruler, measuring tape, or a downloadable nipple ruler (available on most pump websites).
- Complete nursing: measure once your nipples are extended (i.e., after nursing or pumping).
- Measurement across the base: measure just the nipple in millimeters from one side to the other at its widest point. Do not measure in the areola.
- Add two to four millimeters: your measurement, after adding 2-4 mm, will give you the recommended flange size.
For example, if your nipple measures 17 mm then consider a 19-21 mm flange.
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Sizing Guide (Approximate Reference):
| Nipple Diameter (mm) | Suggested Flange Size (mm) |
|---|---|
| 13–15 mm | 15–17 mm |
| 16–18 mm | 18–21 mm |
| 19–21 mm | 21–24 mm |
| 22–24 mm | 24–27 mm |
| 25 mm and above | 27–30 mm |
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What Is a Perfect Fit?
Now that you have selected the flange size based on your measurements, it’s time to test out the size while pumping.
Signs of a Good Flange Fit:
- There is no rubbing against the tube walls as your nipple can move freely.
- Your areola is only slightly drawn into the tube.
- You do not feel any burning, pulling, or pinching while pumping.
- After pumping, your nipple does not turn white, red, or swollen but stays the same color.
- You have good, steady milk flow.
Signs that Your Flange Is Too Small:
- You feel your nipple pressing against the walls of the tunnel or discomfort.
- Your nipple is confined or “squished” after pumping.
- You have a decreased milk flow.
Signs that Your Flange Is Too Big:
- You are pulling in an excessive amount of areola into the tube.
- You are experiencing chafing or friction of the areola.
- You have swelling of your breasts or pulling sensation.
Tips for Tricky Fits and Changes
You might eventually find that modifications will need to be made even after determining the best size of the flange. This is because breast tissue changes over the course of your nursing career, which means that while one size might work today, it might not work next month.
Here are a few reminders.
- Your size may Adjust: Postpartum swelling, hormonal changes, or fluctuations in milk production can impact your nipple diameter. You should recheck yourself at least every few weeks, especially within the first month.
- Soft versus Hard Flanges: While hard flanges have more suction, silicone or flexible flanges can provide a more comfortable fit. Both should be sampled to determine which fits best.
- Pumping Hands-Free: If you’re using a portable or wearable pump, be sure your flanges are positioned correctly because if they’re not you could be losing a significant amount of suction.
- Pain Shouldn’t Be Normal: Mild soreness is expected when pumping for the first time, but if you feel uncomfortable, are red or swelling, that’s a sign something is off, so check your position and flange size.
- Observe Your Milk Supply: If your milk supply has dropped suddenly, evaluate whether your flange fit has changed.
Helpful Tips for Pumping on a Regular Basis:
Apply a warm compress before pumping to encourage milk flow and relieve pain.
- Massage While Pumping: For complete drainage, gently squeeze the breast when pumping.
- Keep Your Flanges Clean: Washing and checking your flange component for buildup or cracks that could impact suction is always a good idea.
- Replace Damaged Parts: If you’re not getting a strong suction, regularly inspect your tubing, membranes, and/or valves to see if any have been compromised.
Momcozy Insights: Whether you’re at home or out and about, newer breast pump flanges sizes are designed to make pumping more comfortable and flexible, all while maintaining a natural seal and excellent suction for every mom out there.
Conclusion
Identifying the correct flange size is one of the most important—and sometimes overlooked—steps to effective breast pumping. Having a properly fitting flange supports your breast health, reduces discomfort, and improves your ability to express milk.
Comfortable, effective pumping starts with the right gadgets. Be sure to check breast pump flange sizes that best suit your body to ensure every drop counts, as pumping is easier and more enjoyable when you are comfortable.
