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Flange Sizing: What Most Pumps Get Wrong
Meet Willow Go
Designed for more comfort & milk output
Expert Tips & Advice
Our best-selling pump, powered by innovative ComfortFlow™ technology for more milk output. Customizable hospital-grade suction, app-controlled, and ranked #1 Wearable Breast Pump by Babylist, this top seller is perfect for multitasking moms. Kit comes with 21, 24mm flanges & 5 oz SplashGuard™ containers.
Willow 3.0 is now 360. 100% leak-proof, hospital-grade, app-controlled, and supported by 360 Care. Comes with 21mm inserts & 24mm flanges.
The first-ever 2-in-1 double manual pump with an ergonomic handle that also connects to your traditional pump for a hands-free experience—no charging required. Includes 24mm flange made of soft silicone for a smooth fit and optimal milk flow.
Designed to create consistent passive suction, our new pump can be worn to gently induce letdown and relieve discomfort.
Meet the Breast Milk Cooler that cools faster and stays colder for up to 24 hours vs. leading milk coolers.* Plus, with new sizes, colors, and two ways to cool, this patent-pending Cooler safely and stylishly lets moms store milk wherever the day takes them.
*Compared to leading milk coolers in Eurofins 2026 controlled, third-party testing
The all-in-one cleaning kit for pump parts, bottles, and more. Just add your favorite soap!
Protect your pump on-the-go with our sleek, sturdy, and easy-to-clean carrying case.
Everything you need to prioritize breast care and comfort, catch every drop of hard-earned breast milk, and feed with more confidence. Plus, every purchase includes access to a virtual appointment with an International Board Certified Lactation Consultant (IBCLC), as well as a free digital feeding course.
Same high-quality bag, new top-quality tech. Our durable, leak-proof bags are now designed with a scannable, AI-enabled code to auto-input your milk bag information into your digital stash in the Willow app. However you choose to pour and store, you’ll finally have the control and peace of mind you crave.
The first-ever 2-in-1 double manual pump with an ergonomic handle that also connects to your traditional pump for a hands-free experience—no charging required. Includes 24mm flange made of soft silicone for a smooth fit and optimal milk flow.
Find your perfect breast pump flange fit with a wide range of inserts designed for maximum pumping comfort and milk output.
Our silicone sizing inserts help to optimize output for moms who measure between 13 mm and 27 mm.

Your pumping questions, answered
Your pumping questions, answered
Guides, tools, and coaches to support every stage of your pumping journey.
Answer a few quick questions & we'll help you find your perfect match.
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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