How to Use the Willow Sync Flange Set for a Comfortable, Leak-Free Fit

Quick Answer

To get a comfortable, leak-free fit with your Willow Sync flange set, start by measuring your nipple size and choosing the correct flange. Then, align the flange properly in your bra, ensure a secure latch, and check for a snug but not tight seal before pumping. Replace flanges every 90 days or when you notice wear.

Getting a comfortable, leak-free fit with your Willow Sync flange set is key to a successful pumping session. Many moms struggle with flanges that are too big or too small, leading to discomfort or leaks. This guide walks you through the entire process, from sizing to installation to maintenance.

Whether you're new to wearable pumps or just need a refresher, these practical steps will help you get the most out of your Willow Sync pump. We'll also highlight common mistakes to avoid along the way.

Measure Your Nipple Size for the Right Flange

The first step to a comfortable fit is knowing your nipple size. Use a ruler or a nipple sizing tool to measure the diameter of your nipple (not the areola) in millimeters. Willow Sync flanges typically come in sizes like 21mm and 24mm, but you may need a different size if your measurement falls between or outside these options.

A flange that's too small can cause friction and pain, while one that's too large can pull in too much areola, reducing output and causing soreness. If you're unsure, many lactation consultants recommend sizing up if you're between sizes, but always follow the manufacturer's guidance.

• Measure your nipple after a brief pump or when it's at its typical size, not when it's cold or overly engorged.
• If you're between sizes, try the larger flange first to avoid pinching.

Install the Flange Correctly

Once you have the right flange size, insert it into the pump flange body or breast shield, ensuring it sits flush and secure. For Willow Sync, the flange should create a gentle seal against your breast. Make sure the flange opening is centered over your nipple.

If your pump uses a flange insert, check that it's fully seated and has no gaps. A misaligned flange can cause leaks and reduce suction. Take a moment to inspect the flange for any cracks or wear before each use.

• Always wash your hands before handling flanges to keep them clean and free from residue.

Position the Pump in Your Bra

With the flange installed, place the pump into your nursing or pumping bra. The flange should be centered over your nipple, and the pump should sit comfortably without shifting. Adjust your bra so it provides enough support to hold the pump securely but not so tight that it compresses your breast.

A good fit means the pump stays in place even if you move around. If you feel the pump moving or leaking, readjust the flange and bra before starting your session.

• Use a bra that is designed for hands-free pumping to ensure a stable fit.

Start Pumping and Monitor the Seal

Turn on your pump and start with a lower suction level. As the pump runs, check that the flange is still sealed and that no air is escaping. You should feel a gentle pulling sensation, not pain. If you feel any discomfort, stop and adjust the flange or reduce the suction.

Watch for any milk leaking around the flange. If you notice leaks, turn off the pump, reposition the flange, and try again. A proper seal is essential for both comfort and efficiency.

• If you experience pain, it may be a sign that the flange size is incorrect—re-measure and consider a different size.

Clean and Replace Flanges Regularly

After each use, disassemble the flange set and wash it with warm, soapy water or use a pump sterilizer according to the manufacturer's instructions. Allow all parts to air dry completely before reassembling to prevent mold and bacteria growth.

Over time, flanges can wear out, losing their shape and effectiveness. Willow recommends replacing pump parts every 90 days or when you notice signs of wear, such as cracks, discoloration, or a change in suction. Regular replacement ensures consistent performance and hygiene.

• Keep a spare flange set on hand so you're never caught without a clean one.

Step-by-Step Flange Fit Checklist

1. Measure your nipple: Use a ruler to measure the diameter in mm and choose the closest flange size (e.g., 21mm or 24mm). Checkpoint: If you're between sizes, go up to avoid pinching.
2. Install the flange: Insert the flange into the pump body, ensuring it's centered and flush. Checkpoint: Inspect for cracks or gaps before each use.
3. Position in bra: Place the pump in a supportive pumping bra, centered over your nipple. Checkpoint: The pump should not shift when you move.
4. Start pumping and check seal: Begin at low suction and monitor for leaks or discomfort. Checkpoint: Stop and adjust if you feel pain or see milk leaking.
5. Clean and replace regularly: Wash after each use and replace parts every 90 days or when worn. Checkpoint: Keep a spare set for convenience.

Willow Sync Flange Products

• Willow Sync Splashguard Container Set (2-pack): Replacing Your Parts For optimal output, replace every 90 days (or when you notice discomfort or signs of wear). This set includes splashguard containers that work with your Willow Sync flanges, and the 90-day replacement guideline helps you maintain a comfortable, leak-free fit.
• Willow 360® Replacement Parts Set: Keep your Willow 360 pump working its best with this replacement parts bundle! Replacing Your Parts For optimal output, replace every 90 days (or when you notice discomfort or signs of wear). Even though this is for Willow 360, the same 90-day replacement rule applies to Willow Sync flanges, so you know when to swap out parts for optimal performance.

With the right flange size and proper installation, your Willow Sync flange set can provide a comfortable, leak-free pumping experience. Take the time to measure correctly, check the seal, and maintain your parts, and you'll be set for successful pumping sessions.