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 360) results in optimal output and comfort.
Still need your nipple measurements?
Measured Nipple Size | Willow Recommended Size Flange / Insert |
9-11mm | 13mm insert in 24mm flange |
12-13mm | 15mm insert in 24mm flange |
14-15mm | 17mm insert in 24mm flange |
16-17mm | 19mm insert in 24mm flange |
18-20mm | 21mm flange |
21-23mm | 24mm flange |
24-26mm | 27mm flange |