When your pump flange fits properly, you get more comfort, a better latch, and more milk.  To get the most accurate measurement, it’s important to measure your nipples to make sure you have the right size flange or insert for Willow®.  To determine your nipple size we suggest using the sizing tool that came in your Willow Go box.

Willow flanges are available in three sizes; 21mm, 24mm, and 27mm.  Willow sizing inserts fit perfectly in the 24mm flange and are available in sizes 15mm, 17mm, and 19mm. 

Additional resources to consider 

Download and print our sizing tool 

What should I do if I'm between Willow's sizes? 

What is my Willow Go size and what sizes are available? 

What if I need two different size flanges/sizing inserts? 

App Ruler Tools - Configuration steps for accurate nipple measurement

In most cases, correcting one of these 3 things will improve your pumping volume. 

Size - Have you measured your nipples and are you wearing a Willow flange or container insert that is 2 - 4mm larger than your measured size? Both of these factors are critical to milk output with Willow. Follow the guidelines for sizing here to get the right size for you.

Bra - Wearing the right bra can help with volume. Your bra should hold the pumps firmly to your breasts for greater comfort and volume. We recommend wearing Willow with a full-coverage nursing bra that’s stretchy and has a flap. We have several recommended bras that work well with Willow here.

Alignment - It is important to line Willow up with your nipple before latching. Study the direction your nipple points and elongate or stimulate your nipple so you are sure of the direction it will point under suction. Keep trying, most moms master this in 5 - 7 sessions. If it is not comfortable or no milk is flowing, remove and realign. 

Additional resources to consider:

Do you have tips to boost volume?

My milk volume has changed suddenly, how to I boost supply?

What is my Willow size and what sizes are available?

Do I need to wear a special bra with Willow?

How do I check if milk is flowing?

Proper assembly of Willow Go is essential for a successful pumping session. Misassembly can lead to leaking or low or no suction on the pumps.

Assembly is easy - Just six parts, stack them together and then press to secure. Watch the full assembly process in this video.

Pro tips

• Parts must be in good condition and replaced at signs of wear and tear. See how to inspect your parts here.
• Assemble with dry, clean parts. Water and milk fat residue make parts slippery.
• Align the diaphragm tabs with the pump guides and push the diaphragm all the way through the pump. Listen for a ‘pop.’
• Attach the container back to the pump straight on or clam-shelled from the bottom to avoid folding or crumpling of the diaphragm. Listen for both sides to ‘click’ into place at the same time.

               

• Assemble the flange last and squeeze firmly. Check that the duckbill did not get pushed off.

Fill out the form below if you are experiencing these issues during assembly

• Container back is too tight and difficult to assemble
• Duckbill pops off or falls off even when pushed on tight and assembled dry with no milk fat residue

Additional resources to consider

Hints to correctly assemble Willow Go™

How do I disassemble Willow Go™?

When Willow Go™ is assembled correctly, is there a space between the container back and the pump? Is this correct?

After every use, you can use the top rack of the dishwasher or wash by hand the five washable parts. Allow your parts to air dry before your next use, you can speed the process by removing the majority of the water with a towel after washing.  The pump itself is not washable. Wipe with a damp cloth as needed.  

Do not use sanitizers, microwave sterilizing bags, or steam sterilizers to clean or sterilize these parts.  

Additional resources to consider

How do I clean Willow Go?

What needs to be done prior to first use with Willow Go?

The Willow Go™ App lets you know what’s happening with your pump. You’ll receive in-app messages for pairing your pumps, app tracking permission (iOS only), location permission (Android only), Bluetooth reminders, and pump updates.

Additional resources to consider

How do I check my suction level and suction levels available in the Willow Go App? 

How do I know a pump update is available for Willow Go and how do I get the update? 

How do I know if my pumps are connected to the Willow Go App?  

My pump shows as ‘Disconnected' in the Willow Go App. How do I connect it? 

Here are some hints to help you figure out what’s going on. 

• Make sure the pump is not connected to the charger. As a safety measure, the pump will not turn on when connected to the charger.
• Is your pump charged?  You can check battery status in the app. If it's not charged, charge it and try again.
• Are you holding the power button down long enough?  You’ll need to hold it for 1 - 2  seconds until pumping begins.

Additional resources to consider

How do I reset my Willow Go™ pump and when do I need to? 

What do I do if I see a red flashing LED indicator on the Willow Go pump?

What do I do if my Willow Go pump or pump parts get damaged?

What do Willow Go lights mean?

Regularly inspect your pump and pump parts for cracks, tears, damage, and wear and tear. If an issue is identified with a part, stop using it immediately and replace it. 

Additional resources to consider

How do I reset my Willow Go pump and when do I need to?

What do I do if I see a red flashing LED indicator on the Willow Go pump?

What do Willow Go lights mean? 

If you prefer the fast-paced suction - feel free to remain in stimulation for the entire session or switch back to it anytime, play around with all 6 Stimulation suction levels to see which is best for you.  

The pump will start in stimulation mode and automatically switch to expression mode after two minutes of pumping. Press the mode button at any time to change manually. 

If your body reacts better to the slower-paced suction, you’ll want to spend most of your session in expression mode. There are 9 levels of suction to choose from in expression, again, play and see what removes the most milk.  

Additional resources to consider

What suction levels are available on Willow Go?

Do you have some tips to improve supply?

Can I power pump with Willow Go?

Here are some hints to help you figure out what’s going on. 

• If your pump will not turn on, make sure it’s not connected to the charger. As a safety measure, the pump will not turn on when connected to the charger. 
• Is your pump charged?  If not, charge it and try again. 
• Are you holding the power button down long enough?  You’ll need to hold it for 1 - 2  seconds until pumping begins.
• Do you know your current suction level? Check the Willow Go™ app. The decrease suction button won’t work when you’re at level 1, and the increase suction button won’t work when you’re at the highest level for stimulation (6) or expression (9).
• If you’ve dropped your pump or if it’s been exposed to liquid, the buttons may not work. Try resetting the pump. If this doesn’t help, stop using the pump and Contact Us so we can help you.

Additional resources to consider

How do I reset my Willow Go pump and when do I need to?

What do I do if I see a red flashing LED indicator on the Willow Go pump?

What do Willow Go lights mean?

We have several resources available to help with pairing, each is specific to your concern, please see our list of resources below and if you don’t find the topic you are looking for Contact Us!  

Additional resources to consider

How do I pair my Willow Go™ pumps to a new smart device? 

My Willow Go pump was "Not found." I need help with pairing.

I uninstalled and reinstalled the Willow Go App and now my pumps won't pair. 

I didn't pair my pumps when I first installed the Willow Go App. How do I pair them? 

How do I know if my pumps are connected to the Willow Go App? 

My pump shows as ‘Disconnected' in the Willow Go App. How do I connect it?

How do I know a pump update is available for Willow Go and how do I get the update? 

How do I pair a Willow Go replacement pump?

We can best assist you with this issue over the phone (English Only). Email responses may take 24 hours. 

Call Willow Care

Willow Care is available Monday-Friday from 6am-6pm PT, and Saturday-Sunday from 7am-1pm PT. Give us a call at 1-855-WILLOW-5. 

Gathering the information below will help us provide faster service.

1. Email used with the app

2. Pump serial number(s)

If it's currently outside our business hours or you prefer to send an email, please use the form below.