When it comes to breast pumps, fit really matters — and fit starts with your flange. Perfecting your flange fit has a direct impact on your comfort and output while pumping.
The Breast Pump Sizing Kit makes it easy to:
✓ Take your nipple measurements
✓ Experiment with sizing inserts
✓ Access expert-backed education
✓ Connect with a Willow Sizing Specialist for personalized guidance
5x insert sets (13mm, 15mm, 17mm, 19mm, and 21mm) that fit inside 24mm flanges to customize your perfect pump fit
Nipple Sizing Tool to measure your nipples
How it works
- To find your insert size, add 1–3mm to your nipple measurement. If pumping still doesn’t feel comfortable, experiment with the other inserts. (Also, make sure you’re wearing a snug, stretchy pumping bra!)
- Book your session with a Willow Sizing Specialist if you need additional support
You also get exclusive access to a 15-minute virtual session with a certified Willow Sizing Specialist. Need a hand with those measurements? They've got you covered. Do you have burning questions about your fit? Willow Sizing Specialists have the answers.
