Frequently Asked Questions

Trying to decide if Willow is right for you? Explore our FAQs and reach out to our all-mom team if you still need help.

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Considering Willow?

What makes Willow different from traditional breast pumps?

What makes Willow different from other wearable or hands free pumps?

Do I need to use Milk Bags with Willow?

What flange sizes do you offer?

Do I need a special bra for Willow?

Will Willow still work if I produce more than four ounces on each side?

Which smartphones support the Willow Generation 3 App?


What makes Willow different from traditional breast pumps?

Willow is 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 features seven levels of suction comparable to most double-electric and hospital-grade pumps. Our latest Generation 3 model was engineered to yield even more milk and offer more comfort and control. Generation 3 has a slower, softer pumping rhythm, new sensitivity setting, and Smart Suction Technology that adjusts based on your comfort preferences.

What makes Willow different from other wearable or hands free pumps?

Compared to other wearable pumps, Willow is the only one that offers complete mobility—360 degrees of motion enabled by our patented, continuous latch and Spill-Proof Milk Bags. That means you can pump in any position, even doing yoga or lying down. Other wearable pumps imitate Willow’s in-bra design, but leak if you move too much. Willow also features the fewest parts to clean—only 2 with Flanges/Milk Bags and 3 with our Reusable Containers. Plus, Willow’s longer battery life helps keep you pumping on the go all day.

Do I need to use Milk Bags with Willow?

No! Willow 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.

What flange sizes do you offer?

The right flange is key for maximizing comfort and output. Up to 60% of women are pumping using the wrong flange, and we strongly recommend measuring yourself to determine your Willow size (it might be different from other pumps you’ve used). Our Flanges and Containers are offered in 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 recommend purchasing a 24mm Willow Pump Kit with your corresponding Sizing Insert. Check out our Sizing Guide or get in touch for more sizing help.

Do I need a special bra for Willow?

Willow 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.

Will Willow still work if I produce more than four ounces on each side?

Our Spill-Proof Milk Bags and Reusable Containers hold up to 4 oz of milk (8 oz total). Willow 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.

Which smartphones does the Willow Generation 3 App support?

The Willow Generation 3 iOS App is available for iOS 13.x or later.

The Willow Generation 3 Android App is available for the following Android phones running Android Pie 9.x or later.

  • Samsung: Galaxy S8, S8+, S8 Active, Galaxy S9, S9+, Galaxy S10e, S10, S10+, Note10, Note20
  • Google: Pixel 1 & 1 XL, Pixel 2, Pixel 3 & 3 XL, Pixel 3a & 3a XL, Pixel 4 & 4 XL
  • LG: G6, G6+, G7, G8, V30, V40, V50

Insurance & FSA/HSA

Is Willow covered by insurance?

Can I use my FSA/HSA?

Do you offer payment plans or financing?


Is Willow covered by insurance?

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.

Can I use my FSA/HSA?

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.

Do you offer payment plans or financing?

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 $399.99 (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.

Warranty & Returns

Does Willow have a warranty?

Can I return Willow if it doesn’t work for me?

Willow Return & Exchange Policy for Bras


Does Willow have a warranty?

Yes! Willow is covered under a 12 month warranty from the purchase date, and most accessories — Flanges, Flextubes™, Containers, and Container Inserts — are covered under a 90 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 willowpump.com or an authorized retailer as it is required to exercise your warranty.

Willow 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.

Can I return Willow?

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.
  • The Willow Wearable breast pump is a single-user medical device and returns must be new, unopened (no seals broken), unused, and in the original packaging.

Willow Return & Exchange Policy for Bras

This policy applies to all items other than the Willow pump 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.
  • tems 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.

Where To Buy

Where can I purchase Willow?

Can you ship Willow internationally?

Can I still buy accessories for previous Generation pumps?


Where can I purchase Willow?

The Willow Pump and accessories are available for purchase through our website and authorized retail partners: buybuyBABY, Target, Amazon, Babylist, The Motherly Shop, and FSAStore.com. You can also purchase through the following durable medical equipment providers who are licensed to sell breast pumps: BreastPumps.com, Acceleron, Aeroflow, 1 Natural Way, Baby’s on Broadway, Milk Moms, and The Breastfeeding Shop.

Willow’s warranty applies to purchases made at any of the above authorized retailers.

Can you ship Willow internationally?

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.

Can I still buy accessories for previous Generation pumps?

Yes, Flextubes™, Milk Bags, Chargers, and Sizing Inserts are compatible with all Willow Generations. Containers are compatible with Generations 2 and 3, and we no longer offer Generation 1 Flanges. For additional questions, please reach out to our team.