To measure flange size for a breast pump, follow these steps:
- Measure Nipple Diameter
Use a ruler, measuring tape, or a printable nipple measuring tool to measure the diameter of your nipple at its widest part (usually the base) in millimeters. Measure both nipples as they may differ in size
- Add 1–4 mm for Comfort
After measuring, add about 1 to 4 mm to your nipple diameter to find the ideal flange size. This extra space allows the nipple to move freely without pain or excessive friction during pumping. Most sources recommend adding 2–3 mm as a general guideline
- Check Fit During Pumping
- The nipple should move gently inside the flange tunnel without pain or swelling.
- Only the nipple (not the areola) should enter the tunnel.
- If the flange is too small, it causes friction and pain; if too large, it pulls in too much areola causing discomfort
- Use Flange Size Charts or Tools
Printable flange size charts and online calculators are available from many breast pump brands (e.g., Medela, Spectra, Elvie) to help match your nipple measurement to the correct flange size
- Additional Tips
- Measure before pumping, not after, to get an accurate size.
- If you experience discomfort or poor milk flow, consider trying a different flange size or consulting a lactation provider for professional fitting
In summary, measure your nipple diameter at the base in millimeters, add about 2–3 mm for comfort, and select a flange size accordingly. Use available charts or tools for guidance and ensure the flange fits comfortably during pumping without pulling in the areola or causing pain
