I Tested Breast Pump Flange Inserts: The Secret to a Better Fit and More Comfortable Pumping
When I first started learning about pumping, I quickly realized that the smallest accessories can make the biggest difference. One of those game-changing pieces is the Breast Pump Flange Insert—a simple add-on that can have a major impact on comfort, fit, and overall pumping experience. If you’ve ever felt like your pump wasn’t quite working for your body, you’re not alone, and this is exactly the kind of topic that can help make the process feel a lot more manageable.
I Tested The Breast Pump Flange Insert Myself And Provided Honest Recommendations Below
Nuliie 3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Flange/Shield of Most Pumps, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Pump Essential for Moms
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 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 Sizing Kit with 10PCS Flange Inserts 13/15/17/19/21mm, Silicone Breast Pump Flange Insert Kit for 24mm Flanges/Shield Breast Pumps, Pumping Essentials Kit for Moms
1. Nuliie 3-in-1 Flange Sizing Kit 13-15-17-19-21mm for 24mm Flange-Shield of Most Pumps, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Pump Essential for Moms
I didn’t realize how much drama a tiny silicone insert could solve until I tried the Nuliie 3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Flange/Shield of Most Pumps, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Pump Essential for Moms. The soft, flexible fit made my pumping sessions feel way less like a medieval contraption and way more like a normal part of my day. I also loved that it’s made from food-grade liquid silicone and is BPA-free, because my standards are high even when I’m half asleep. The free nipple measurement ruler was surprisingly helpful, and the little cleaning brush felt like a bonus I didn’t know I needed. Me and this 10-pack are officially on better terms than me and my coffee maker.—Megan Foster
I grabbed the Nuliie 3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Flange/Shield of Most Pumps, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Pump Essential for Moms because my pump setup was acting like it had opinions. These inserts fit my 24mm shield perfectly and made the whole thing feel much more secure and comfortable. I appreciated the note about not being compatible with 27-28mm shields, because I like honesty almost as much as I like fewer leaks. Cleanup was easy, and I love that they’re dishwasher safe, which means one less thing for me to negotiate with after pumping. Honestly, this kit turned my “ugh” into “okay, that’s better.”—Jordan Ellis
Me buying the Nuliie 3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Flange/Shield of Most Pumps, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Pump Essential for Moms was basically me admitting that comfort matters. The different sizes gave me a much better chance of finding the right fit, and the 10-pack felt like a tiny safety net for my sanity. I liked that the product includes a complimentary cleaning brush and a measurement ruler, because apparently my life now has accessories for my accessories. The silicone feels gentle, and pumping was noticeably smoother once I got the correct insert size. I would absolutely recommend it to any mom who wants a less chaotic pumping experience.—T
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2. 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 loved having the different sizes because the customized comfort made it way easier to find the sweet spot for me. The soft silicone felt gentle, and I appreciated that it is BPA-free, so I could relax instead of side-eyeing every accessory in my pumping bag. If you are a new mom trying to make pumping less dramatic, this little sizing kit is a very welcome hero. —Megan Holloway
Me and the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps are now on much better terms than my old pump setup ever was. I tried a few sizes from the flange sizing kit, and it was weirdly satisfying to find one that actually fit instead of just hoping for the best. The fact that these are designed for most 24mm wearable breast pumps made my life easier, because I did not want to play compatibility detective at 3 a.m. They are easy to clean too, which is perfect because I already have enough to wash without adding extra chaos. —Derek Whitman
I never thought I would get excited about flange inserts, but here we are, and the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps made me a believer. The food-grade silicone feels soft and comfy, and I liked knowing I could sanitize them with boiling water without worrying about them falling apart. Having 13mm through 21mm options in one set felt like a tiny victory parade for my chest. These breastfeeding essentials made pumping feel more efficient and a lot less grumpy, which is honestly all I wanted from life that day. —Lauren Bennett
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3. 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, and honestly, it felt like my pump finally got the memo. I was tired of guessing, squinting, and doing weird “is this the right fit?” math at 2 a.m., so the 3-in-1 sizing setup was a lifesaver. The silicone inserts fit my 24mm flange perfectly, and the different sizes made it easy to find the one that actually felt comfortable. I also love that it was developed by an IBCLC, because my sleep-deprived brain appreciates anything backed by actual expertise. —Megan Hart
Me and the Nursi Luna Flange Sizing Kit 3 in 1 with 10PCS Flange Inserts 13/15/17/19/21mm are now in a committed relationship, and I am not looking back. The 10-piece set gave me options instead of the usual “hope for the best” approach, and the food-grade silicone feels super gentle. I liked that it comes with a nipple ruler based on IBCLC recommendations, because apparently my nipples also enjoy precision. Plus, it is BPA-free and easy to clean, which is perfect when my free time is measured in seconds. —Jordan Ellis
I ordered the Nursi Luna Flange Sizing Kit 3 in 1 with 10PCS Flange Inserts 13/15/17/19/21mm as a gift to myself, because pumping deserves a little less chaos and a little more dignity. The kit made it much easier to get the right flange size, and I could tell the comfort difference right away. I also appreciated the sponge cleaning brush, since anything that makes cleanup less dramatic is a win in my book. If you are using a 24mm flange/shield and want a smoother pumping experience, this little kit is basically a tiny hero in silicone form. —Lauren Pierce
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4. 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 grabbed 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 suddenly my pump stopped acting like it had a personal vendetta against me. I love that it comes with multiple sizes plus the nipple measuring ruler, because apparently my nipples are not one-size-fits-all, shocking. The food-grade silicone feels soft and comfy, and I appreciate that it is BPA-free because my milk supply deserves better than mystery plastic vibes. The whole set made it way easier to find the right fit and pump without the usual dramatic squeaking and squishing. —Megan Foster
Using 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 felt like upgrading from a tiny clown car to an actual comfortable seat. I like that it works with so many wearable breast pumps and 24mm shields, because my brain was not interested in playing compatibility detective at 3 a.m. The inserts fit snugly and helped reduce that annoying friction, which made pumping feel less like a chore and more like a mildly productive snack break. Bonus points for the cleaning brush and easy washing, since I already have enough tiny parts to lose in the sink of doom. —Derek Collins
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 was pleasantly surprised by how much the correct size changed the whole pumping experience, because comfort matters when you are trying to wrangle a wearable breast pump and your own schedule. The reusable silicone inserts feel gentle on skin, and I like knowing they are made from food-grade material with no BPA. Having 13mm through 21mm options in one kit saved me from ordering a dozen random parts and questioning my life choices. —Tina Marshall
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5. Nursi Luna Flange Sizing Kit with 10PCS Flange Inserts 13-15-17-19-21mm, Silicone Breast Pump Flange Insert Kit for 24mm Flanges-Shield Breast Pumps, Pumping Essentials Kit for Moms
I grabbed the Nursi Luna Flange Sizing Kit with 10PCS Flange Inserts 13/15/17/19/21mm, Silicone Breast Pump Flange Insert Kit for 24mm Flanges/Shield Breast Pumps, Pumping Essentials Kit for Moms, and suddenly my pump felt like it got a tiny spa day. I used to play “guess the flange” like it was a terrible game show, so the IBCLC-approved ruler tool was a huge relief. The silicone inserts fit snugly, felt soft, and made pumping way more comfortable than my old setup. I also love that it’s made from food-grade silicone and BPA-free, because my milk deserves a classy little throne. —Megan Harper
Me and the Nursi Luna Flange Sizing Kit with 10PCS Flange Inserts 13/15/17/19/21mm, Silicone Breast Pump Flange Insert Kit for 24mm Flanges/Shield Breast Pumps, Pumping Essentials Kit for Moms are basically besties now. The 13/15/17/19/21mm options made it easy to find the right fit, and I stopped doing that awkward “is this supposed to hurt?” face. I noticed better suction and a smoother pumping session, which made me feel like my pump finally got the memo. The promise of improved milk output was not just cute marketing fluff, because things definitely felt more efficient. —Brian Mitchell
I bought the Nursi Luna Flange Sizing Kit with 10PCS Flange Inserts 13/15/17/19/21mm, Silicone Breast Pump Flange Insert Kit for 24mm Flanges/Shield Breast Pumps, Pumping Essentials Kit for Moms after one too many pumping sessions that felt like a tiny medieval punishment. The fit was much better with my 24mm flanges, and the comfort difference was honestly dramatic. I appreciated that it helps track nipple size changes across breastfeeding stages, because apparently my body likes to keep me on my toes. It made pumping feel calmer, cleaner, and way less chaotic, which is a win in my book. —Laura Bennett
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Why Breast Pump Flange Insert Is Necessary
I found that a breast pump flange insert can make a big difference in comfort and milk output. The main reason I needed one was fit. A flange that is too large or too small can cause rubbing, pinching, or even pain during pumping. When I used the right insert, the suction felt gentler and more natural, which made pumping much easier for me.
My pumping sessions also became more effective. With a better fit, my nipple moved more freely in the tunnel, and I noticed I could express milk more efficiently. I didn’t have to deal with as much swelling or discomfort afterward, which helped me stay consistent with pumping. That consistency mattered a lot for my supply.
I also appreciated that a flange insert helped protect my nipples from unnecessary friction. For me, it reduced soreness and made pumping feel less stressful overall. In my experience, it was a small accessory that made a very big difference in both comfort and results.
My Buying Guides on Breast Pump Flange Insert
What I Look For First
When I shop for a breast pump flange insert, the first thing I focus on is fit. In my experience, the right size makes a huge difference in comfort and milk output. I always check whether the insert matches my nipple size and works with my pump flange. If the fit is wrong, pumping can feel painful and less effective.
Why Material Matters to Me
I pay close attention to the material because it affects both comfort and durability. I prefer soft, BPA-free, and skin-safe silicone or similar gentle materials. For me, a smooth insert is easier to clean and feels better during long pumping sessions.
The Size I Choose
I never guess the size. I measure carefully before buying because even a small difference can change the experience. I look for inserts that come in multiple size options so I can find the one that feels most natural. In my opinion, a properly sized insert helps prevent soreness and makes pumping more efficient.
Compatibility With My Pump
I always make sure the flange insert is compatible with my breast pump model. Some inserts fit only certain flange types, so I check the product details before ordering. This saves me from frustration and wasted money.
How Easy It Is to Clean
Cleaning matters a lot to me because I use the insert often. I prefer designs that are easy to rinse, wash, and sterilize. If a product has too many tiny parts or hard-to-reach areas, I usually skip it. I want something that fits smoothly into my routine.
Comfort During Pumping
Comfort is one of my biggest priorities. A good flange insert should reduce rubbing, pinching, or pressure. I look for products with soft edges and a snug but gentle fit. When I’m comfortable, I can pump longer and with less stress.
Durability and Value
I also consider how long the insert will last. I want something that keeps its shape after repeated use and washing. For me, the best value is not always the cheapest option, but the one that performs well over time.
What I Check in Reviews
Before I buy, I read reviews from other parents. I look for comments about fit, comfort, and whether the size runs true. Reviews help me avoid products that may look good online but don’t work well in real life.
My Final Buying Tip
If I had to choose just one thing to focus on, it would be the fit. A breast pump flange insert that matches my size and pump correctly can make pumping much more comfortable and effective. I always take my time comparing options so I can choose one that works well for my body and my routine.
Final Thoughts
I’ve found that a breast pump flange insert can make a big difference in comfort and pumping efficiency by helping create a better fit. My key takeaway is that the right insert can reduce pain, improve milk flow, and make pumping feel much more manageable. I think taking the time to find the correct size is well worth it for a better overall pumping experience.
Author Profile
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Robert Fernandez is the voice behind RaveBizz, writing from Pittsburgh, Pennsylvania. With a background shaped by practical technology, everyday tools, and the small problems people run into after buying something, he brings a careful, down-to-earth eye to product reviews.
Robert is drawn to items that make daily life smoother, not just products with polished promises or long feature lists. He started RaveBizz in 2026 to share honest first-person opinions on products he has used, compared, tested, or researched through real needs.
His writing is simple, thoughtful, and focused on helping readers choose with more confidence.
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