Find your flange size
A good fit makes expressing more comfortable and can help you express more milk. Measure your nipple diameter only, not the areola, and measure before you pump.
16.0 mm
8 mm
34 mm
This is a guide, not a fitting. Fit can change over the first few weeks, so it is worth measuring again. If expressing hurts, stop and speak to a midwife or lactation consultant.
How to measure
- Measure across the base of your nipple in millimetres. Do not include the areola.
- Measure before you express, not after.
- Choose a tunnel 2 to 3mm wider than your measurement. Between sizes, start with the larger one.
Printing the guide below? Set your printer to 100% scale, not “fit to page”, or the measurements will be wrong.