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.

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.

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.

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.

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.

Breast pumps and accessories are regulated as single-user products, and cannot be returned once the safety seal has been broken. See our returns policy.

You can return an unopened Willow Pump within 90 days of the purchase date. If you decide to return your unopened pump or accessories, please review our return policies.

Only products purchased from onewillow.com may be returned directly to us. For products purchased from our retail partners, please follow their instructions.

Willow Wearable breast pumps are single-user medical devices and returns must be new, unopened (no seals broken), unused, and in the original packaging.

This policy applies to all items other than Willow pumps or pump accessories, such as bras. If you decide to return your purchase, here are the details of our return policy:

Only products purchased from onewillow.com may be returned directly to us. Items must be returned in their original packaging and unused. Wearable items must be unworn and have tags attached. Your return request must be submitted within 30 days of the purchase date. You are responsible for all shipping charges. Willow will only refund the purchase price of the product and any sales tax paid, and the refund will be made to the original form of payment.

If you need to exchange your product for a different size:

Items must be returned in their original packaging and unused. Wearable items must be unworn and have tags attached. Your exchange request must be submitted within 30 days of the purchase date.

Contact us to start the exchange process. Please provide your order number, order date, and a brief note on why you are requesting an exchange. You are responsible for all shipping charges. Once an exchange is initiated, you have 30 days to return your product.