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.
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.
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.
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 |
Note: The dimensions of different brands may differ significantly. For instance, Momcozy provides a variety of breast pump flange sizes that easily fit both tiny and big diameters.
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