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.
A must-have for every nursing mom: The only wearable in-bra manual pump with an ergonomic handle and hospital-strength, two-phase suction - no charging required. Includes 24 mm flange made of soft silicone for a smooth fit and optimal milk flow.
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.
Optimize breast milk storage with our new Breast Milk Bag Flatteners, designed to help you neatly and efficiently organize every last drop.
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.
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? Try our sizing guide
|
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 |
Sizing inserts can only be used with a 24mm flange or 24mm container insert.
Questions? Our experts can help.
1-888-WILLOW-3

Step 1: Get a measuring tape
Measure the diameter of your nipple at its base while erect to determine its size accurately.

Step 2: consider sizing up
Most moms find that adding 1-3mm to their nipple size results in optimal output and comfort.

Step 3: take a look at our chart
Match your measurements to our sizing chart to find your recommended size flange / insert.
2 Willow 360 Flanges
You can shop all Willow 360 accessories here.
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For optimal output, replace every 90 days (or when you notice discomfort or signs of wear).
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