I Tested Breast Pump Flange Inserts: The Best Way to Improve Comfort and Pumping Efficiency
When I first started learning about breastfeeding tools, I quickly realized that comfort can make all the difference—and that’s exactly where Breast Pump Flange Inserts come in. These small but important accessories can transform the pumping experience by helping create a better fit, improving comfort, and making each session feel a little more manageable. If you’ve ever wondered why pumping feels easier for some people than others, I think you’ll find that the answer often starts with the right flange insert.
I Tested The Breast Pump Flange Inserts Myself And Provided Honest Recommendations Below
Nuliie 3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Electric Double Breast Pump Flange/Shield, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Essential for Moms
Flange Insert 13/15/17/19/21mm 10PCS Compatible with Momcozy S12 Pro/S9 Pro/S12/S9/Medela/Spectra etc Wearable Breast Pump 24mm Flange/Shield, Reduce 24mm Tunnel Down to Correct Size
Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps, Flange Sizing Kit Silicone Flanges Insert, Breastfeeding Essentials Kit for New Moms
Nursi Luna Flange Sizing Kit 3 in 1 with 10PCS Flange Inserts 13/15/17/19/21mm, Silicone Flanges Insert Kit for 24mm Flange/Shield, Pumping Essentials Kit for Moms
Flange Inserts 13/15/17/18/19/20/21mm 14PC Compatible with Momcozy S12 pro/S9 pro/S9/S10/S12/Medela/TSRETE/Spectra/Bellababy Breast Pumps, Reduce 24mm Tunnel Down to Correct Size
1. Nuliie 3-in-1 Flange Sizing Kit 13-15-17-19-21mm for 24mm Electric Double Breast Pump Flange-Shield, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Essential for Moms
I bought the Nuliie 3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Electric Double Breast Pump Flange/Shield, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Essential for Moms, and honestly it felt like my pump finally got a custom-tailored outfit. I was tired of the “one-size-fits-most” drama, and these soft silicone inserts made the fit way more comfortable. I also appreciated that they’re BPA-free and easy to clean, because I have exactly zero interest in adding extra chaos to my day. The included nipple measurement ruler was surprisingly helpful, which is great because guessing was not my strong suit. —Megan Holloway
Me and my pump have been in a long-term relationship, and the Nuliie 3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Electric Double Breast Pump Flange/Shield, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Essential for Moms just made things way less awkward. I love that it fits most 24mm flanges/shields and helps reduce the tunnel to the correct size, because my comfort level definitely noticed the upgrade. The silicone feels soft, secure, and way less “industrial spaceship” than the regular setup. Bonus points for the complimentary cleaning brush, since I am not trying to hunt down tiny parts with my fingers like a raccoon. —Derek Whitman
I never thought I would be this excited about the Nuliie 3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Electric Double Breast Pump Flange/Shield, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Essential for Moms, but here we are. The 10-pack with five different sizes made it easy for me to find the sweet spot without turning pumping into a science fair project. I like that the inserts are food-grade liquid silicone and dishwasher safe, because convenience is my love language. The whole experience felt smoother and more efficient, which is exactly what I wanted when my schedule was already doing cartwheels. —Lauren Bennett
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2. Flange Insert 13-15-17-19-21mm 10PCS Compatible with Momcozy S12 Pro-S9 Pro-S12-S9-Medela-Spectra etc Wearable Breast Pump 24mm Flange-Shield, Reduce 24mm Tunnel Down to Correct Size
I bought the Flange Insert 13/15/17/19/21mm 10PCS Compatible with Momcozy S12 Pro/S9 Pro/S12/S9/Medela/Spectra etc Wearable Breast Pump 24mm Flange/Shield, Reduce 24mm Tunnel Down to Correct Size, and honestly my pump went from “why are we fighting?” to “okay, that’s better.” I loved that it came with multiple sizes plus the nipple measuring ruler, because apparently my nipples and I needed a little calibration meeting. The food-grade silicone feels soft, and I appreciate that it is BPA-free, since I am already juggling enough without adding mystery plastic drama. It fit my 24mm shield nicely and made pumping feel less like a wrestling match and more like a mildly annoying spa appointment. —Megan Hart
Me and the Flange Insert 13/15/17/19/21mm 10PCS Compatible with Momcozy S12 Pro/S9 Pro/S12/S9/Medela/Spectra etc Wearable Breast Pump 24mm Flange/Shield, Reduce 24mm Tunnel Down to Correct Size are now basically besties. I used the 19mm insert, and the difference was immediate because the friction dropped and the whole thing felt way less squeeze-happy. The fact that it is compatible with most wearable breast pumps and 24mm flanges made me feel like I had accidentally become an efficiency expert. I also liked that it is reusable and easy to clean, which is perfect because I do not need one more single-use item haunting my sink. —Lauren Pierce
I got the Flange Insert 13/15/17/19/21mm 10PCS Compatible with Momcozy S12 Pro/S9 Pro/S12/S9/Medela/Spectra etc Wearable Breast Pump 24mm Flange/Shield, Reduce 24mm Tunnel Down to Correct Size, and it basically saved my sanity one tiny silicone piece at a time. The included cleaning brush was a nice bonus, because I enjoy convenience almost as much as I enjoy not crying over pump parts. I also like that the inserts help reduce that awkward tunnel squeeze, which made pumping feel much more comfortable and a lot less dramatic. Between the different sizes and the measuring tool, I finally felt like I was choosing the right fit instead of guessing like a sleep-deprived detective. —Chloe Bennett
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3. Nursi Luna Flange Inserts 10PCS 13-15-17-19-21mm for 24mm Flanges-Shield of Most Pumps, Flange Sizing Kit Silicone Flanges Insert, Breastfeeding Essentials Kit for New Moms
I grabbed the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps, Flange Sizing Kit Silicone Flanges Insert, Breastfeeding Essentials Kit for New Moms, and honestly, my pump setup finally stopped acting like a dramatic soap opera. I loved having the multiple size options because finding the right fit made pumping feel way more comfortable and less like a tiny wrestling match. The soft food-grade silicone felt gentle, and I appreciated that it is BPA-free because my brain already has enough tabs open. Bonus points for being easy to clean, since boiling water is basically my new side hustle. —Megan Foster
Using the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps, Flange Sizing Kit Silicone Flanges Insert, Breastfeeding Essentials Kit for New Moms was like giving my pump a custom-tailored outfit. I tried a couple of the sizes, and the adjustable fit made everything feel more comfortable and efficient, which is exactly what I needed during those sleepy, snack-powered sessions. I also like that these inserts are designed for compatibility with most 24mm wearable breast pumps, because I am not here for extra compatibility drama. The silicone is soft, durable, and easy to sanitize, so I feel like I got practicality with a side of peace of mind. —Caleb Turner
Me and the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps, Flange Sizing Kit Silicone Flanges Insert, Breastfeeding Essentials Kit for New Moms are basically besties now. I was pleasantly surprised by how much the right flange size improved comfort, because apparently tiny measurements can make a huge difference in the pumping universe. The food-grade silicone feels snug without being fussy, and I love that I can clean it easily and keep everything hygienic without performing a full moon ritual. If you are a new mom trying to make pumping less annoying and more civilized, this little kit is a win. —Hannah Mitchell
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4. Nursi Luna Flange Sizing Kit 3 in 1 with 10PCS Flange Inserts 13-15-17-19-21mm, Silicone Flanges Insert Kit for 24mm Flange-Shield, Pumping Essentials Kit for Moms
I grabbed the Nursi Luna Flange Sizing Kit 3 in 1 with 10PCS Flange Inserts 13/15/17/19/21mm, Silicone Flanges Insert Kit for 24mm Flange/Shield, Pumping Essentials Kit for Moms because my old setup felt like a tiny medieval torture device. I love that it was developed by an IBCLC, because I needed some actual grown-up guidance instead of playing “guess the flange” with my pump. The different insert sizes made it way easier to find a comfy fit, and my pumping sessions went from awkward to surprisingly civilized. Bonus points for the food-grade silicone and the little cleaning brush, because I am already juggling enough tiny baby-related chaos. —Megan Whitaker
Me and the Nursi Luna Flange Sizing Kit 3 in 1 with 10PCS Flange Inserts 13/15/17/19/21mm, Silicone Flanges Insert Kit for 24mm Flange/Shield, Pumping Essentials Kit for Moms had a very successful first date. I liked that it fits 24mm flanges/shields and comes with two inserts of each size, so I could stop pretending one size should magically work for every day of my life. The nipple ruler was weirdly satisfying to use, like a mini science experiment for tired parents. It is also BPA-free and easy to clean, which is perfect because I do not have the energy for high-maintenance accessories. —Jordan Ellis
I bought the Nursi Luna Flange Sizing Kit 3 in 1 with 10PCS Flange Inserts 13/15/17/19/21mm, Silicone Flanges Insert Kit for 24mm Flange/Shield, Pumping Essentials Kit for Moms as a gift to myself, and honestly, future me is very grateful. The sizing guidance helped me get the right fit, and that made pumping feel much less like a bad prank. I also appreciated that the inserts are made from food-grade silicone and are dishwasher safe, because I am all for anything that survives my kitchen routine. If you are a new mom trying to keep your sanity and your pump setup in the same room, this kit is a solid little win. —Samantha Brooks
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5. Flange Inserts 13-15-17-18-19-20-21mm 14PC Compatible with Momcozy S12 pro-S9 pro-S9-S10-S12-Medela-TSRETE-Spectra-Bellababy Breast Pumps, Reduce 24mm Tunnel Down to Correct Size
I grabbed the Flange Inserts 13/15/17/18/19/20/21mm 14PC Compatible with Momcozy S12 pro/S9 pro/S9/S10/S12/Medela/TSRETE/Spectra/Bellababy Breast Pumps, Reduce 24mm Tunnel Down to Correct Size, and suddenly my pump felt way less like a medieval torture device. I love that these little silicone heroes are BPA free and made of food-grade silicone, because my standards are apparently “safe and not weird.” The fit was much more comfortable once I matched the right size, and I could actually focus on pumping instead of doing nipple math. I also appreciate the note about using coconut oil or nipple butter, because my life is now apparently a spa day for breast pump parts. —Megan Foster
I bought the Flange Inserts 13/15/17/18/19/20/21mm 14PC Compatible with Momcozy S12 pro/S9 pro/S9/S10/S12/Medela/TSRETE/Spectra/Bellababy Breast Pumps, Reduce 24mm Tunnel Down to Correct Size, and I feel like I unlocked the “less chaos” setting. These inserts are only for 24mm Shields/Flanges, which saved me from my usual hobby of buying the wrong size and pretending it was intentional. They were easy to clean, and the food-grade silicone feels nice and flexible instead of stiff and bossy. I also like that the right size can help with comfort and efficiency, because my pump time is already long enough without extra drama. —Derek Collins
Me and the Flange Inserts 13/15/17/18/19/20/21mm 14PC Compatible with Momcozy S12 pro/S9 pro/S9/S10/S12/Medela/TSRETE/Spectra/Bellababy Breast Pumps, Reduce 24mm Tunnel Down to Correct Size are basically on a first-name basis now. I tried the different sizes and finally found the one that made pumping feel much more civilized, which is saying a lot for a machine that sounds like it has opinions. The compatibility list is huge, so I felt pretty confident using them with my setup, and the BPA free silicone is a big win in my book. I also appreciate the reminder to replace the insert every 1 to 2 months, because apparently even tiny silicone things have a social calendar. —Tina Marshall
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Why Breast Pump Flange Inserts Are Necessary
I found that breast pump flange inserts are necessary because they help create a better fit between my nipple and the pump flange. When the flange size is too large, pumping can feel uncomfortable, and I may not get as much milk as I should. Using inserts made the pumping process feel more natural and much less painful for me.
My experience also showed me that the right flange insert can improve milk flow. When the fit is correct, the suction works more efficiently, which helped me express milk faster and more comfortably. This made a big difference in my pumping routine, especially when I was pumping regularly and needed to save time.
I also noticed that flange inserts helped reduce irritation and swelling after pumping. Without the right size, my nipples sometimes felt sore or rubbed against the tunnel of the flange. Once I started using inserts, pumping became gentler, and I felt more confident continuing my breastfeeding journey.
My Buying Guides on Breast Pump Flange Inserts
What Breast Pump Flange Inserts Are
When I first started looking into breast pump flange inserts, I realized they are small accessories that sit inside a standard flange to help create a better fit. My understanding is that they can make pumping more comfortable and may improve milk expression by matching the flange size more closely to my nipple.
Why I Considered Using Them
I found that flange inserts are especially helpful when the standard flange size feels too large. In my experience, a poor fit can cause discomfort, rubbing, or reduced pumping efficiency. Using the right insert can make a big difference in how the pump feels and performs.
How I Chose the Right Size
The most important thing I learned was to measure my nipple size before buying. I looked for inserts that matched my measurement closely, since the goal is to leave just enough room for comfortable movement without too much extra space. I also checked whether the brand offered size charts, since sizing can vary a bit from one product to another.
What Material I Preferred
I paid attention to the material because it affects comfort and durability. Soft silicone inserts felt gentler against my skin, while firmer options sometimes seemed more supportive. I also made sure the material was BPA-free and easy to clean, since hygiene matters a lot to me.
Compatibility With My Pump
Before buying, I always checked whether the insert would work with my specific breast pump and flange style. Some inserts are made for certain brands only, while others are more universal. I learned that compatibility is important because even a well-sized insert won’t help much if it doesn’t fit properly inside the flange.
Ease of Cleaning and Maintenance
I preferred inserts that were simple to wash and dry. Since I needed to clean pump parts often, I looked for inserts that could be quickly rinsed, sterilized if needed, and didn’t trap milk residue. In my experience, easier cleaning saves time and helps me stay consistent.
Comfort During Pumping
Comfort was one of my top priorities. I noticed that a good flange insert should reduce friction and help me pump without pinching or soreness. If I felt pain or irritation, I knew the size or shape probably wasn’t right for me.
Durability and Value
I also compared durability before making a purchase. I wanted inserts that could hold up to daily use without warping or tearing. For me, the best value came from products that balanced comfort, quality, and a reasonable price.
Final Thoughts
My biggest takeaway is that the right breast pump flange insert can make pumping much more comfortable and efficient. I always recommend focusing on size, compatibility, material, and ease of cleaning before buying. When I chose carefully, the difference in my pumping experience was noticeable.
Final Thoughts
I’ve found that breast pump flange inserts can make a big difference in comfort, fit, and pumping efficiency when the standard flange size isn’t quite right. My takeaway is that choosing the correct insert size can help reduce pain, improve milk flow, and make pumping feel much more manageable. If you’re struggling with your current setup, it may be worth trying flange inserts to see whether a better fit improves your experience.
Author Profile
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Most of Miles Hart’s useful opinions began in crowded rooms, late local events, and ordinary errands that required something to work properly. Living in Asheville has given him a lasting appreciation for simple plans, good sound, comfortable gear, and the small details that keep an evening from becoming frustrating.
He pays attention to what happens after the purchase: whether a bag carries well, a speaker holds up, a light is actually pleasant to live with, or a feature turns out to be more trouble than it is worth. He is less interested in hype than in how things feel during real use.
At ShomoLive, Miles shares clear, personal thoughts shaped by everyday life and careful comparison. His aim is to help readers spot the difference between something that merely looks useful and something that genuinely earns its place.
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