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Flange Sizing: What Most Pumps Get Wrong
Meet Willow Go
Designed for more comfort & milk output
Expert Tips & Advice
Protect your pump on-the-go with our sleek, sturdy, and easy-to-clean carrying case.

Your pumping questions, answered
Your pumping questions, answered
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One of the most important measurements that determines whether you pump comfortably is the flange tunnel length.
If it's too short, your nipple is likely to crash into the back of the pump and cause pain while pumping, which can lead to many issues including lessened milk output.
It's our best seller for a reason. Powered by innovative ComfortFlow™ technology, Willow Go is designed to fit your anatomy, giving you more comfort, convenience, and milk output.
Accommodates more nipples (even elastic!) to avoid abrasion.
A curved flange edge prevents pinching or pulling of breast tissue.
Clinically proven to express a higher volume of milk in less time.
Ensures even weight distribution for better nipple alignment.
Join more than 5,000 moms in the Willow Community to find answers to common breastfeeding questions, learn from Willow experts, and connect on all things postpartum.

WILLOW IS THE ONLY LEADING PUMP BRAND FOUNDED AND BASED IN THE U.S. THAT’S A TEAM BUILT OF WOMEN INNOVATING FOR WOMEN.
WILLOW IS THE ONLY LEADING PUMP BRAND FOUNDED AND BASED IN THE U.S. THAT’S A TEAM BUILT OF WOMEN INNOVATING FOR WOMEN.
Inventor of the first wearable breast pump in 2017
US-based, clinically tested, and FDA approved.
120+ patents and 5 trademarks
World-class smart technology
Since creating the first fully wearable pump, we've continued to innovate in ways that always put moms first - helping them extend their breastfeeding journey with more freedom and less compromise.
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