Hospital-grade, fully in-bra
360° leak-proof pumping
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Willow pumps are unique because everything works inside the pump, inside your bra—no external tubes, cords, or dangling bottles. Plus, you don’t have to sacrifice performance. Willow 3.0® and Willow Go™ offer hospital strength suction comparable to most double-electric and hospital-grade pumps - choose from seven levels of adjustable suction with Willow 3.0, or nine levels with Willow Go. They’re also easy to assemble, clean, and app connected.
Willow 3.0 offers complete, leak-free mobility when pumping with our Spill-Proof Milk Bags. With its gravity-defying continuous latch suction technology, you can pump in any position, from bending over to lying down. Willow Go doesn’t offer as full of a range of motion, but offers the same completely in-bra design and lets you pump totally hands-free and untethered. Willow Go’s “tug and release” suction technology is comparable to traditional pumps and other wearable pump brands.
Willow 3.0 offers more milk storage options. It’s compatible with Spill-Proof Milk Bags and reusable Containers, while Willow Go offers Containers only.
Both pumps are app connected, but Willow 3.0 offers smart pumping that tracks volume in real time and automatically records your session. Check out our comparison page for more, or take our pump quiz to decide which pump is right for you.
Willow 3.0 is the only wearable pump that offers total mobility—360 degrees of motion enabled by our patented, continuous latch and Spill-Proof Milk Bags. Other wearable pumps imitate Willow 3.0’s in-bra design, but leak if you move too much.
It’s also the only wearable pump that offers two ways to pump and store your milk - choose from self-sealing Milk Bags or Containers.
Willow 3.0 is the only pump that offers the option to pump into Spill-Proof Milk Bags or Reusable Containers. Milk Bags enable total 360 degree mobility, while Containers offer 180 degree mobility, superior to other wearable pumps. Milk Bags are not compatible with Willow Go.
Willow® 3.0 and Willow Go™ works best with a bra that provides a supportive, snug fit to hold it in place. We recommend wearing a full-coverage nursing bra that’s stretchy and has a flap. Avoid bras with underwire or padding.
Willow® 3.0’s Spill-Proof Milk Bags and Reusable Containers hold up to 4 oz of milk (8 oz total). Willow 3.0 automatically shuts off when your Milk Bag or Container is full. If you pump more than 4 oz in a single session, you can easily switch out the bag or empty the container and continue pumping.
Willow Go™ holds up to 5 oz of milk (10 oz total). If you pump more than 5 oz per side, purchase our 7 oz containers to pump up to 14 oz per session (sold separately).
The Willow 3.0 App is available for devices that run the following operating systems:
The Willow 3.0 iOS App is available for iOS 14.x or later.
The Willow 3.0 Android App is available for the following Android phones running Android OS 10.x or later.
The Willow Go™ App is available for devices that run the following operating systems:
iOS 14 and higher
Android OS 10 and higher (must support Bluetooth 5.1)
Keep in mind, due to the significant number of different Android device models, Willow® cannot guarantee optimal performance of our pumps across all devices.
Finding the right size is key to maximize comfort and output. Willow offers flanges in three sizes: 21mm, 24mm, and 27mm. If you measure smaller than 21mm, we offer sizing inserts in three sizes (15mm, 17mm, and 19mm) that snap into our 24mm flanges and containers.
We strongly recommend measuring yourself to determine your Willow size, as our sizing may be different than other pumps you’ve used. Use 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.
Nipple size can change throughout your breastfeeding journey, often getting smaller over time. If you sized at the hospital and are considering a Willow purchase several months into breastfeeding, it’s time to re-size.
We recommend re-sizing every three months, or anytime you order a fresh flange or insert. We also suggest re-sizing whenever you experience an unexpected change in volume or comfort, as that may indicate an incorrect flange size.
Many moms obtain full or partial reimbursement for a Willow Pump and accessories through insurance. Each company has its own policy and every plan is different. We now offer an Insurance Verification Program to easily check your coverage and if eligible, buy your pump and accessories at a discounted price. Check out our Insurance Coverage Guide for more information.
Yes! Simply pay for your Willow 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. We currently accept one credit card per purchase. If you want to to split your payment, you can pay with your credit card and submit your receipt for possible FSA/HSA reimbursement.
Yes! We partner with Affirm to offer an easy way to pay for your pump and accessories over time. Interest rates vary from 0-30% APR, and there are no hidden charges—no late fees, service fees, or prepayment fees. A minimum purchase of $299.99 (before tax) is required, and your payments will be made directly to Affirm. For more information, please visit: www.affirm.com/faqs.
Affirm payment subject to credit check and approval. Down payment may be required. Affirm loans are made by Cross River Bank, a New Jersey State Chartered Commercial Bank, Member FDIC.
The Willow Pump and accessories are available for purchase through our website and authorized retail partners: buybuyBABY, Target, Amazon, Babylist, and FSAStore.com. You can also purchase through the following durable medical equipment providers who are licensed to sell breast pumps: BreastPumps.com, Acelleron, Aeroflow, 1 Natural Way, Baby’s on Broadway, Milk Moms, The Breastfeeding Shop, Pumping Essentials, Byram Healthcare and The Lactation Network.
Willow’s warranty applies to purchases made at any of the above authorized retailers.
No, not at this time. Our ultimate goal is give women around the world their hands and their time back—so it’s something we hope to offer in the future.
Yes, Flextubes™, Milk Bags, Chargers, and Sizing Inserts are compatible with all Willow Generations (except Willow Go). Containers are compatible with Generations 2 and 3, and we no longer offer Generation 1 Flanges. Willow Go accessories and replacement parts are available for purchase on our site. For additional questions, please reach out to our team.
When alignment is off, performance suffers. As a new user, we suggest practicing your alignment in a mirror several times before your first session.
Simply center the flange or container (without the pump attached) over your nipple, so there’s no skin touching the top, bottom, or sides of the flange or container tunnel. When you place the flange inside the pump for your first session, you’ll have a better idea of alignment, which will improve as you gain experience. Most moms master alignment after a few sessions.
Please use the grid below to find the right size for you. The Perfect Pumping Bra is offered in 8 sizes: XS - 3XL and Petite Plus. Please note that this bra runs small; we recommend sizing up if you’re between sizes.
The standard cup size refers to the typical cup measurement you wear, and the standard band size refers to the typical band size you wear. For example, if you typically wear a 34D bra, you would wear a size M in the Perfect Pumping Bra. If you typically wear a 38G bra, you would wear a 2XL in the Perfect Pumping Bra.
Yes! Willow Pumps are covered under a 12 month warranty from the purchase date, and pump accessories — all replaceable pump parts including but not limited to flanges, FlexTubes™, containers, milk bags, diaphragms, duckbills, chargers and sizing inserts — are covered under a 90 day warranty. Other physical products, including but not limited to bras, are covered under a 60 day warranty. Sizing Inserts should be replaced upon signs of wear and tear. Since breast pumps are single-user devices, use by more than one person, including purchasing second hand, will invalidate the warranty. Please keep your original proof of purchase from onewillow.com or an authorized retailer as it is required to exercise your warranty.
Willow 3.0 cannot be used with any charger that is not provided with the pump or purchased as an accessory from Willow. Usage of third-party charging accessories is unsafe, may cause serious damage to your pump, and will invalidate the warranty.
Willow pump devices ("Pumps"); all replaceable pump parts including but not limited to flanges, FlexTubes™, containers, milk bags, diaphragms, duckbills, chargers and sizing inserts ("Pump Accessories") and all other physical products including but not limited to bras ("Accessories") may be returned as follows. Pumps, pump accessories, and other accessories, can be returned for a replacement, or a refund of the purchase price and sales tax paid, within sixty (60) days from the date the confirmation is sent to you for the purchase, provided that the applicable item: was purchased from www.onewillow.com; is returned in its original packaging; is unused and unopened (no seals broken); and is returned in its original condition. You must contact us to start the return process and to obtain a RMA number before shipping the product. No returns will be accepted without an RMA number.
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