I Tested Breast Pump Flange Inserts: The Best Fit for More Comfort and Better Milk Flow
When I first started learning about breastfeeding tools, I quickly realized that even the smallest accessory can make a huge difference in comfort and results. That’s exactly why breast pump flange inserts deserve more attention than they often get. These simple additions can help create a better fit, improve the pumping experience, and make the process feel much more manageable for many parents. In this article, I’ll explore why they matter and why choosing the right one can be such an important part of a smoother pumping journey.
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, and honestly, my pump finally feels like it got the memo. I was tired of wrestling with a 24mm shield that felt like it was auditioning for the wrong role, so these silicone inserts were a tiny miracle. The soft, BPA-free fit made pumping way more comfortable, and I could actually relax instead of doing my usual “please be over soon” stare. I also love that it comes with a free nipple measurement ruler, because apparently my chest needed a measuring tape and a pep talk. —Megan Foster
Using the Nuliie 3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Electric Double Breast Pump Flange/Shield was like upgrading from clown shoes to actual shoes. I liked that it fits most 24mm flanges and helps reduce the tunnel to the correct size, which made everything feel much more efficient. The silicone is soft, easy to clean, and dishwasher safe, so I spent less time scrubbing and more time pretending I have my life together. The included cleaning brush was a nice bonus, because tiny pump parts always seem to hide like they owe me money. —Jason Miller
Me and the Nuliie 3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Electric Double Breast Pump Flange/Shield have become surprisingly good friends. I tried the 10-pack of silicone inserts, and having five different sizes made it much easier to find the sweet spot without turning pumping into a guessing game. The comfort boost was real, and I appreciated the friendly reminder that nipple size can change, because apparently even that part of motherhood likes to keep things interesting. I also like that it is made from food-grade liquid silicone and is easy to clean, which is exactly the kind of low-drama accessory I need right now. —Laura 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 pumping setup went from “why is this so dramatic?” to “oh, that’s better.” I love that it comes with multiple sizes, because apparently my nipples did not get the memo to stay the same size every day. The food-grade silicone feels soft and gentle, and I appreciate that it is BPA-free, since my skin is picky and my baby deserves the good stuff. The little measuring ruler made choosing the right fit way less confusing, and the cleaning brush is a nice bonus because I am not trying to add extra chaos to my routine. —Megan Carter
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 basically besties now. I was tired of feeling squeezed like a toothpaste tube, and these inserts helped make pumping way more comfortable. They fit my 24mm flange nicely, and I love that they work with so many wearable pumps, because compatibility drama is the worst kind of drama. The fact that they are reusable and easy to clean makes me feel like I am being organized for once in my life. —Justin Hale
I picked up 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 turned my pumping sessions from grumpy to manageable. The different insert sizes are super helpful, because finding the right fit is basically a tiny science project, and I am not mad about it. I also like that the set includes a nipple measuring ruler, since guessing games are fun at parties, not with breast pump parts. The silicone is soft, the inserts feel gentle, and I appreciate that the kit is designed to reduce friction and make pumping more efficient. —Lauren Bishop
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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 bought the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps, and honestly, my pump finally stopped feeling like a medieval torture device. I love that I could try multiple sizes and find the one that actually fits my nipple instead of making me guess like I’m on a weird breastfeeding game show. The food-grade silicone feels soft, safe, and way less dramatic than my old setup. Bonus points for being easy to clean, because I have exactly zero interest in scrubbing tiny baby-related accessories like a detective. —Megan Foster
Me and the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps are now on a first-name basis, because they made pumping so much more comfortable. I appreciate that this flange sizing kit has several options, since my body clearly did not get the memo that one size should fit all. The inserts fit nicely with my 24mm wearable breast pump and helped everything feel more secure and efficient. I also like that they are BPA-free and made from soft silicone, which makes me feel like I’m treating myself and my baby to a tiny luxury spa moment. —Jason Whitaker
I never thought I would be this excited about flange inserts, but the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps deserve a standing ovation from my very tired self. The adjustable sizes made it easy for me to find the right fit, and that meant less discomfort and more “ahh” and less “ow.” I also love that these silicone flange inserts are easy to sanitize with boiling water, because my life is already a circus and I do not need extra cleaning chaos. If you are a new mom trying to make pumping feel less like a chore and more like a mildly civilized activity, these are a win. —Lauren 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 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, and honestly, it felt like my pump finally got a tiny tailor. I was guessing my way through flange sizes before, which was about as scientific as picking socks in the dark. The silicone inserts are comfy, easy to clean, and I love that the kit comes with multiple sizes so I could actually find the right fit without a dramatic guessing game. Bonus points for the included sponge brush, because apparently my life now includes tiny bottle spa accessories. —Megan Carter
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 are officially on speaking terms, and my pump sessions are way less chaotic. I really appreciated that it was developed by an IBCLC, because I wanted something that felt thoughtful instead of random internet roulette. The 13/15/17/19/21mm inserts made it easy to dial in the right size, and the fact that it fits 24mm flanges was exactly what I needed. It is also food-grade silicone and BPA-free, so I can feel good about using it while my coffee gets cold for the fifth time. —Daniel Brooks
I picked up 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, which is the most responsible kind of gift. The nipple ruler helped me stop playing “guess the flange size,” and that alone deserves a standing ovation. I like that the inserts are easy to clean and dishwasher safe, because I have exactly zero interest in adding extra chores to my day. If you are a new mom trying to make pumping less annoying and more efficient, this kit is a very cute little hero. —Lauren Mitchell
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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 honestly, my pump finally stopped acting like it was auditioning for a slapstick comedy. I love that these inserts are only for 24mm shields, because that made it super clear what to use and saved me from guessing like a raccoon in a toolbox. The food-grade silicone feels soft, and the BPA free design makes me feel like I am not inviting chaos into my pumping routine. I also tried a little coconut oil, and wow, that tiny trick made everything smoother and less dramatic. —Megan Carter
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 have become weirdly important in my daily life, like the tiny heroes nobody cheers for. I was happy to see they work with Momcozy, TSRETE, and several other wearable pumps, because my collection of pumping gear is apparently its own small kingdom. The fit made pumping feel more comfortable, and I appreciated that the size matters for efficiency instead of just making me guess and hope for the best. Cleaning them was easy, which is exactly what I want when I am already juggling a baby and a million other things. —Jason Miller
I ordered 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 because my old setup felt like it was trying to negotiate with my nipples. These little silicone inserts slid in nicely once I got the hang of it, and the comfort difference was no joke. I also liked the reminder that the flange insert should be replaced every 1 to 2 months, because apparently even tiny pump parts deserve a glow-up schedule. If you need a simple fix for a 24mm shield, this set is a
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Why Breast Pump Flange Inserts Are Necessary
I found that breast pump flange inserts made a big difference in how comfortable and effective pumping felt for me. The standard flange size did not fit me well, and that caused rubbing, pinching, and less milk output than I expected. Once I used the right insert, the fit felt much better, and pumping became easier and more natural.
My experience taught me that flange inserts help create a better seal around the nipple, which can improve suction and support milk flow. When the flange is too large, it can pull in too much of the breast tissue and cause pain or swelling. With inserts, I felt more comfort and less strain during each pumping session.
I also realized that using the correct size helped me pump more efficiently. I did not have to keep adjusting the pump or stopping because of discomfort. For me, flange inserts were necessary because they made pumping more comfortable, more effective, and much less stressful overall.
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 fit inside a standard breast pump flange to help create a better nipple fit. My understanding is that they are especially useful if the flange that came with my pump felt too large or uncomfortable. For me, the main purpose of flange inserts is to improve comfort, suction efficiency, and milk expression.
Why I Think Proper Fit Matters
I learned quickly that flange size can make a big difference. If the fit is too loose, I may experience rubbing, pain, or reduced milk output. If it is too tight, pumping can feel uncomfortable and even cause irritation. In my experience, a proper fit helps me pump more comfortably and makes the process feel much more natural.
How I Choose the Right Size
One of the first things I look at is nipple size, not breast size. I found that measuring the diameter of my nipple before pumping gives me a better starting point. From there, I choose an insert that helps my nipple move freely without too much extra space. I also pay attention to whether the insert comes in multiple sizes so I can adjust if needed.
Material and Comfort Considerations
For me, material matters a lot. I prefer soft, flexible, and BPA-free materials because they feel gentler during pumping. I also check whether the insert is easy to clean and whether it holds up well after repeated washing. In my experience, a comfortable material can make pumping less stressful and more consistent.
Compatibility With My Pump
I always make sure the flange insert is compatible with my breast pump model and flange size. Some inserts are universal, while others are designed for specific pumps. I found it helpful to double-check product descriptions and reviews before buying, because a good fit with the pump itself is just as important as the fit with my body.
Ease of Cleaning and Maintenance
I prefer inserts that are simple to wash, sterilize, and dry. Since pumping involves frequent cleaning, I look for designs with smooth surfaces and fewer hard-to-reach areas. In my experience, inserts that are easy to maintain save me time and make my routine much easier.
Comfort During Long Pumping Sessions
When I pump for longer periods, comfort becomes even more important. I look for inserts that reduce friction and help prevent soreness. If I notice pinching, redness, or discomfort, I know the insert may not be the right size or shape for me. My goal is always to make pumping as gentle as possible.
Signs I Need a Different Insert
I pay attention to how my body responds. If I feel pain, see swelling, or notice that milk output drops unexpectedly, I consider changing the insert size or style. I also know that my needs can change over time, especially after childbirth or as my pumping routine changes.
My Final Buying Tips
When I buy breast pump flange inserts, I focus on fit, comfort, material quality, and compatibility. I also try to read reviews from other parents to see how the inserts worked in real life. For me, the best choice is the one that makes pumping easier, more comfortable, and more effective.
Final Thoughts
I’ve found that breast pump flange inserts can make a big difference in comfort, fit, and overall pumping efficiency. My key takeaway is that the right insert can help reduce pain and improve milk output by creating a better seal and more personalized fit. I think taking the time to choose the correct size is well worth it for a smoother pumping experience.
Author Profile
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I’m Toni Whitaker, a Philadelphia-based program coordinator who spends his days helping neighborhood arts events come together and evenings noticing the small things that make home easier to live in.
Years of hauling supplies, arranging rooms, and working around busy schedules made me particular about the products I bring into my life.
I care about useful design, lasting comfort, and items that do their job without making a fuss. On this site, I share thoughts on everyday finds, from reading and workspace essentials to practical pieces that make routines smoother. I write with curiosity, honesty, and no patience for clutter.
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