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Mom-approved bundles for breast care, milk storage, and pumping on the go
Willow 3.0 is now 360. 100% leak-proof, hospital-grade, app-controlled, and supported by 360 Care. Comes with 21mm inserts & 24mm flanges.
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.
Designed to create consistent passive suction, our new pump can be worn to gently induce letdown and relieve discomfort.
Protect your pump on-the-go with our sleek, sturdy, and easy-to-clean carrying case.
Our patent-pending cooler stores up to 16 oz of milk at a safe temperature for up to 24 hours.
The all-in-one cleaning kit for pump parts, bottles, and more. Just add your favorite soap!
Made with plant-based ingredients to remove breast milk residue from your Willow pumps and parts.
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 Milk Containers
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).
Mom-approved bundles for breast care, milk storage, and pumping on the go
Pumping shouldn’t press pause on adventure. Wherever your travels take you, this pack of essentials ensure a comfortable and convenient pumping experience. Bundle includes Willow Wave Pump and Portable Breast Milk Cooler.
Everything you need for smart, safe, and mess-free milk storage––whether you're keeping the refrigerator organized or pumping on the go.
Relieve discomfort or gently induce letdown - and safely store milk when you're done - with the two essentials that provide comfort and convenience in the early days and beyond.
Everything you need to clean and care for your pumps on-the-go.
Yes, you can. Simply pay for your breast pump and accessories using your FSA/HSA debit card at checkout, or pay with another credit card and submit your receipt to your plan administrator for reimbursement.
The right size is key for maximizing comfort and output. Willow offers flanges and containers in size 21mm, 24mm, and 27mm. If you measure smaller than 21mm, we offer Sizing Inserts in sizes 15mm, 17mm, 19mm that snap into our 24mm Flanges and Containers. We strongly recommend measuring yourself to determine your Willow size as it might be different from other pumps you’ve used. Unsure of your size? Visit our sizing guide or check out our exhaustive guide on how to measure your flange size which includes pro tips from Willow’s lactation consultants.
After every use, you can wash by hand or pop the parts in the dishwasher, top rack only.
It’s important to wash breast pumping parts after every session to avoid the growth of bacteria. We also suggest you do not store your Container in the fridge or the freezer. This can lead to decreased performance for the Container.