Find your flange fit.Pump with confidence.
When it comes to wearables, sizing is different — you'll need a fit that's more snug. Most moms find that adding 1-3mm to their nipple size (or 0-2mm if you're pumping with Willow 3.0) results in optimal output and comfort.
Still need your nipple measurements?
|Measured Nipple Size
|Willow Recommended Size Flange / Insert
|13mm insert in 24mm flange
|15mm insert in 24mm flange
|17mm insert in 24mm flange
|19mm insert in 24mm flange