How to Replace and Maintain Willow Go Silicone Flanges for a Comfortable Fit

Quick answer

Replace your Willow Go silicone flanges every 90 days or sooner if you notice discomfort or visible wear. For the best comfort, measure your nipple diameter to choose the right flange size, and clean flanges after every use with soap and water. If your nipple rubs or feels pinched, a different size or sizing insert may be needed.

Willow Go flanges are the soft silicone parts that sit against your breast during pumping. They play a big role in comfort and milk output. Over time, silicone can lose its flexibility and develop tiny cracks that harbor bacteria, so knowing when to replace them keeps your pumping routine safe and comfortable.

This guide walks you through checking your Willow Go flange fit, cleaning them properly, and planning replacements. You'll also learn a few common mistakes to avoid, so you can pump with confidence and fewer surprises.

Check Your Willow Go Flange Size for Comfort

The 24mm flange is the standard size included with Willow Go, and it works for many mothers. But if you measure smaller than 21mm, you may need sizing inserts to get a snug fit. A good fit means your nipple moves freely inside the tunnel without rubbing the sides. If you feel friction, pinching, or see redness after pumping, it's time to reassess the size.

To measure, use a ruler or a nipple sizing card before a feed, when your nipple is at its resting size. Compare the diameter to the available flange sizes. If you're between sizes, it's usually more comfortable to size up rather than down, because a too-small flange can compress milk ducts and reduce output.

• Check for gaps between your nipple and the flange wall—if more than 2mm, consider a smaller size or an insert.
• Remember that breast size can change, so re-check your fit every few months.

When to Replace Your Willow Go Flanges

Willow recommends replacing your flanges every 90 days, or whenever you notice discomfort or signs of wear. Silicone can degrade from repeated washing, exposure to heat, and the natural oils on your skin. Over time, it becomes less tacky and may not seal as well, which can reduce suction and lead to leaks.

Look for tears, discoloration, or a sticky residue that doesn't wash off. If the flange no longer holds its shape, it's time for a fresh set. Using worn flanges can also affect your milk output, so don't wait for obvious damage to replace them.

• Set a calendar reminder every 90 days to check your flange condition.
• If you have twins or pump more than 6 times a day, you might need replacements sooner.

Clean Your Willow Go Flanges After Every Use

Proper cleaning prevents milk residue and bacteria from building up, which can cause odors and affect the silicone's integrity. Rinse flanges in cool water immediately after pumping, then wash with warm soapy water. Use a soft brush or cloth to remove any milk film from the tunnel. Avoid harsh scrubbing that can scratch the silicone.

You can also use a steam sterilizer, but make sure it's approved for medical-grade silicone. Let flanges air-dry fully on a clean rack before storing them. Storing damp flanges can encourage mold and mildew, which is hard to remove and can be harmful.

• Don't use dishwashers with high heat or abrasive detergents, as they can accelerate wear.
• If you notice a soapy residue, rinse with more warm water—residue can affect pumping performance.

Steps to Replace and Maintain Your Willow Go Flanges

1. Measure and choose the right size: Measure your nipple diameter (in millimeters) when it's at rest. Pick a flange that fits without pinching. If you measure smaller than 21mm, use a sizing insert with the 24mm flange. Common mistake: assuming the standard 24mm is right for everyone. Check the fit—a proper size prevents pain and boosts milk flow.
2. Replace flanges every 90 days: Mark your calendar. Even if they look fine, silicone breaks down over time. Replace sooner if you see tears, discoloration, or feel a change in suction. Don't wait for cracks to appear—regular replacement keeps pumping hygienic and comfortable.
3. Clean and dry properly after each use: Rinse with cool water, then wash with warm soapy water. Air-dry on a clean rack. Store in a dry, sealed container if needed. Common mistake: storing damp flanges. This can lead to mold, so always dry them completely before putting them away.

Product Facts

• Willow Go® Flange Set (2-pack): Willow Go's flanges come in 3 sizes so you can find your best fit. In addition, 24mm flanges are compatible with sizing inserts for mamas who measure smaller than 21mm. For optimal output, replace every 90 days or when you notice discomfort or signs of wear. Choosing the right size and replacing flanges on schedule keeps pumping comfortable and efficient, preventing issues like chafing or low milk output.
• Willow Go® Splashguard Container Set (2-pack): Willow Go's reusable milk containers make pumping and transferring milk a breeze. For optimal output, replace every 90 days or when you notice discomfort or signs of wear. Using fresh containers alongside your flanges ensures hygiene and consistent performance, so you can store milk safely and enjoy a smooth pumping session.

Keeping your Willow Go flanges in good shape is simple once you know the basics. Measure your fit, replace them every 90 days, and clean them after every use. By following these steps, you'll enjoy a comfortable pumping experience and keep milk flowing reliably. If you ever notice discomfort or a change in performance, trust your instincts and swap in a fresh set.