When it comes to pumping, one often-overlooked detail can make all the difference: flange size. A poorly fitting flange can cause pain, reduce milk output, or even damage nipple tissue. The right fit boosts both comfort and efficiency.
🍼 What’s a Flange?
The flange (or breast shield) is the funnel-shaped part that fits over your nipple and areola. Its job? Creating a seal for gentle suction and milk flow. But a one-size-fits-all flange rarely works for everyone.
📏 How to Measure Your Nipple for Flange Sizing
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Measure your nipple diameter (not including the areola) in millimeters, ideally after pumping when your nipple is slightly swollen.
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Add 2–4mm to that number to find your flange size.
✅ Flange Size Chart
| Nipple Diameter | Recommended Flange Size |
|---|---|
| 7–12 mm | 15 mm |
| 11–13 mm | 17 mm |
| 14–16 mm | 19 mm |
| 17–19 mm | 21 mm |
| 20–22 mm | 24 mm |
Tip: Use a Flange Measuring Tool for more accuracy.
🚨 Signs Your Flange Doesn’t Fit
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Nipple pain, redness, or rubbing
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Milk output is lower than usual
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Nipples look swollen or pinched after pumping
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Breasts feel full even after pumping
🛠️ Quick Tips
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Flange needs may change over time — remeasure regularly
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Have more than one size on hand
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When in doubt, talk to a lactation consultant
Bottom line: The right flange = less pain, better milk flow, and a smoother pumping experience.
