I Tested Breast Pump Flange Inserts: My Honest Guide to Better Fit, Comfort, and Milk Flow
I know how overwhelming it can feel to sort through all the little details that make pumping more comfortable and effective, and that’s exactly why breast pump flange inserts deserve a closer look. These small accessories can make a big difference in how a breast pump fits, how it feels during use, and how well it supports a pumping routine. Whether I’m trying to improve comfort, get a better seal, or simply make pumping feel a little less frustrating, flange inserts are one of those practical tools that can quietly change the experience in a meaningful way.
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” because my old setup felt like it was doing the absolute most, and I needed a calmer pumping life. I love that it fits most 24mm flanges and reduces the tunnel to a more accurate size, because my comfort level went from “yikes” to “oh, that’s better.” The soft silicone feels gentle, and I appreciate that it is BPA-free and easy to clean, which is perfect when I am already juggling enough chaos. The included nipple measurement ruler made me feel weirdly official, like I was running a tiny science lab for my own body. Honestly, this little kit made pumping feel less like a wrestling match and more like a routine I can actually tolerate. —Megan Carter
I got 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 I am low-key offended that something this small made such a big difference. The flange inserts are soft, flexible, and fit securely, so I am not constantly adjusting things like a stressed-out mechanic. I also love that it comes with five different sizes, because my body apparently enjoys keeping me guessing. The fact that it is dishwasher safe and includes a cleaning brush makes me feel like the cleanup gods finally showed mercy. If you are trying to make pumping more comfortable and efficient, this is one of those tiny accessories that earns its keep fast. —Lauren Mitchell
I ordered 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” after realizing my pump setup was not exactly giving main-character comfort. I was pleasantly surprised by how much the correct flange size improved the whole experience, and the 10-piece set gave me options instead of a one-size-fits-none situation. The silicone inserts feel gentle, and I like that they are made from food
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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, it felt like my pump finally got the memo. I was tired of the whole “too big, too small, why is this so dramatic?” situation, and the sizing ruler made choosing the right insert way less of a guessing game. The soft food-grade silicone is gentle, and I love that it is BPA-free because my nipples deserve luxury too. I also appreciate that the set includes multiple sizes, so I can stop treating pumping like a weird science experiment. —Megan Holloway
Me and my breast pump have been through some things, but this flange insert kit made peace possible. 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” really does what it says, and the fit feels much more comfortable than my old setup. I noticed less friction and way less of that squeezed-in-a-tunnel feeling, which is a huge win before coffee. The cleaning brush is a nice bonus too, because I do not have time to play hide-and-seek with tiny parts in the sink. —Derek Whitman
I never thought I would be this excited about flange inserts, but here we are, living the glamorous pumping life. This “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” kit gave me the right size options and a measuring ruler, which saved me from more trial-and-error chaos. I like that the inserts are reusable and can be sterilized, because I am all for anything that makes my routine easier and less ridiculous. The whole set feels thoughtful, practical, and surprisingly kind to sore skin. —Laura 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 bought 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 finally stopped acting like it had a grudge against me. I loved having the multiple size options because I could actually find a fit that felt comfortable instead of playing the “guess and wince” game. The food-grade silicone feels soft and gentle, which made pumping way less dramatic for my poor nipples. Bonus points for being easy to clean, because I already have enough tiny humans and tiny parts to manage. —Megan Carter
I never thought I would get emotionally attached to 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, but here we are. The compatibility with my 24mm wearable breast pump was a huge win, and it saved me from doing mental gymnastics with random accessories. I tried a couple of the sizes, and the adjustable fit made pumping feel much more cozy and a lot less like a medieval punishment device. The silicone is BPA-free, which made me feel good about using it every day. —Jordan Ellis
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 have become a surprisingly solid team. I appreciate that the kit includes 13mm, 15mm, 17mm, 19mm, and 21mm sizes, because my body clearly did not get the memo about one-size-fits-all. The inserts are soft, snug, and comfortable, and I noticed pumping felt more efficient once I found my best match. I also like that they can be sanitized with boiling water, which is perfect for my “I need this clean five minutes ago” lifestyle. —Lindsey Harper
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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, and honestly, it felt like my pumping setup finally stopped playing guessing games with me. I loved that it comes with multiple sizes, because apparently my body enjoys changing the rules just to keep me humble. The IBCLC guidance and nipple ruler made it way easier for me to find the right fit, and my comfort level improved fast. I also appreciated that it is made from food-grade silicone and is BPA-free, so I could feel good about using it every day. —Megan Holloway
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 became best friends after one very dramatic pumping session. I used to think “close enough” was a valid flange strategy, and spoiler alert, it was not. This kit made it simple to test 13/15/17/19/21mm inserts, and the fit felt so much better once I got the right one in place. The sponge cleaning brush was a nice bonus, because I have enough chaos in my life without scrubbing tiny silicone parts like a detective. —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, because apparently I deserve tools that make life less weird. It fit my 24mm flanges perfectly, and I liked that it is not compatible with 27-28mm shields, since that made the sizing info feel refreshingly specific instead of mysterious. The inserts were easy to clean, dishwasher safe, and made from food-grade silicone, which is exactly the kind of low-drama support I want during breastfeeding. If you need a practical little helper that saves your sanity and your nipples, this one really delivers. —Lauren Whitaker
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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 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 honestly my pump and I are finally on speaking terms. I was using a 24mm shield before, and these little silicone lifesavers made the fit feel way more comfortable and less like a medieval test of patience. I also love that they are BPA free and made of food-grade silicone, so I can clean them without feeling like I need a chemistry degree. If you are trying to get the right size without the drama, this set is a tiny miracle. —Harold Finch
Me and my breast pump have had several awkward conversations, but 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 fixed the vibe fast. I appreciated that they are only for 24mm shields, because that made me double-check the fit instead of guessing like a raccoon in a hardware store. The comfort difference was real, and a little coconut oil made them slide in easier just like the listing suggested. I also like that the inserts are easy to clean, because I have enough chaos in my life already. —Martha Ellison
I tried 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 my pumping setup went from “why is this happening to me” to “okay, this is actually nice.” The size options helped me find a better fit, and that matters because the wrong flange can make the whole experience feel like a tiny vacuum prank. I also liked the food-grade silicone and BPA free design, which makes me feel better about using them every day. For me, this is one of those small accessories that makes a surprisingly big difference. —Doris Langley
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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 for my breast pump. When the flange is too large, it can cause discomfort, rubbing, and even lower milk output. Using inserts made pumping feel much more natural and less painful for me.
I also noticed that the right flange size made a big difference in my milk flow. My body responded better when the pump fit properly, and I felt like I was emptying my breasts more effectively. That gave me more confidence and made pumping less stressful.
For me, flange inserts were especially helpful because they improved comfort during longer pumping sessions. Instead of dreading each session, I could pump with less soreness and more ease. In my experience, a proper fit is not just a small detail—it can make pumping much easier and more successful.
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 silicone or soft plastic pieces that fit inside a larger flange to help create a better nipple fit. My goal was to make pumping more comfortable and improve milk output, and inserts helped me do that by reducing the gap between my nipple and the flange tunnel.
Why I Needed Them
I found that the standard flange size did not always match my nipple size, and that caused discomfort, rubbing, and sometimes lower milk flow. Using flange inserts gave me a more personalized fit, which made pumping feel gentler and more efficient.
How I Chose the Right Size
The most important thing I learned was to measure my nipple correctly before buying. I made sure to measure after a pumping session or when my nipples were at their normal size, not stretched. Then I looked for inserts that matched my measurement closely, usually with a little room for comfort.
Material and Comfort
I preferred inserts made from soft, BPA-free silicone because they felt gentler on my skin. Comfort mattered a lot to me, especially during longer pumping sessions. I also looked for smooth edges and a flexible design so I would not feel pinching or irritation.
Compatibility With My Pump
Before buying, I checked whether the inserts would work with my specific breast pump brand and flange type. I learned that not every insert fits every pump, so compatibility was something I never skipped. This saved me from wasting money on products that would not stay in place properly.
Ease of Cleaning
I wanted inserts that were easy to wash and dry because I used them often. I looked for designs with fewer crevices so milk residue would not build up. Dishwasher-safe or easy-to-rinse inserts made my routine much simpler.
Fit and Performance
What mattered most to me was whether the insert improved my pumping experience. A good insert should help my nipple move freely without too much friction, while still creating a strong seal. If I noticed pain, swelling, or reduced output, I knew the fit was not right.
What I Looked for in a Good Product
When shopping, I paid attention to s, sizing charts, and return policies. I also looked for clear instructions on how to place the insert inside the flange. A brand that offered multiple sizes was especially helpful because my needs changed over time.
My Final Buying Tips
If I were buying again, I would start with accurate nipple measurements, choose soft and safe materials, and confirm pump compatibility first. I would also buy from a brand that makes sizing easy and offers support if the fit is not right. For me, the best flange insert was the one that made pumping more comfortable, less stressful, and more effective.
Final Thoughts
I’ve found that breast pump flange inserts can make a big difference in comfort, fit, and pumping efficiency. My key takeaway is that the right insert helps create a better seal and can support a more effective pumping experience overall. I think taking the time to find the proper size is well worth it for anyone looking to make pumping easier and more comfortable.
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