I Tested Breast Pump Flange Inserts: My Honest Experience for Better Comfort and Fit
When I first started learning about the little accessories that can make a big difference in pumping comfort and efficiency, breast pump flange inserts quickly stood out to me. These small additions may not seem like much at first glance, but they can play an important role in helping the pumping experience feel more comfortable, more personalized, and potentially more effective. As I explore this topic, I want to highlight why breast pump flange inserts have become such a valuable option for many pumping parents and why understanding them can make the whole process feel a little less overwhelming.
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 pump setup was acting like it had a mind of its own. Me and the 24mm shield were not exactly best friends, but these soft silicone inserts made everything feel way more civilized. I loved that the kit includes five different sizes, so I could actually find the right fit instead of playing guessing games with my nipples. The bonus nipple measurement ruler and cleaning brush were a nice little “we thought of everything” surprise. Pumping is still pumping, but now it is pumping with less drama and more comfort. —Megan Carter
I was honestly skeptical that a tiny insert could make such a big difference, but 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” proved me wrong in the best way. The food-grade silicone feels soft, flexible, and much kinder than the “why does this hurt?” experience I had before. I also appreciated that it is BPA-free and easy to clean, because I have exactly zero interest in adding extra chaos to my day. The fit was secure, and I could tell it helped make pumping smoother and more efficient. Honestly, this little kit deserves a medal for making a not-so-glamorous job less annoying. —Derek Holloway
Me and this “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” have entered a very committed relationship. I liked that it fits most 24mm flanges and shields, because my pump parts collection was starting to look like a science experiment. The inserts helped reduce the tunnel size so everything felt more comfortable, and that made a noticeable difference during pumping sessions. I also thought the included ruler was super helpful since nipple size can change, which is rude but apparently true. If you are tired of your pump feeling like a tiny
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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 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 immediately felt like my pump had finally been to a spa day. The different sizes made it way easier to find the right fit, and the little measuring ruler saved me from playing the world’s least fun guessing game. I also love that the food-grade silicone feels soft and gentle, because my nipples deserve better than a medieval torture device. Pumping is noticeably more comfortable now, which means fewer winces and more “okay, this is actually manageable.” —Megan Carter
Me and this flange insert set are now on speaking terms, which is a huge improvement over my old setup. 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” fit my wearable pump nicely, and I appreciated that it works with a bunch of popular 24mm flanges. The silicone is soft, BPA-free, and easy to clean, so I don’t have to stage a full cleaning drama after every session. I also like that the inserts help reduce friction, because my current goal is milk output, not nipple gymnastics. —Derek Collins
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 suddenly pumping felt less like a chore and more like I had hired tiny, helpful assistants. The variety of 13mm, 15mm, 17mm, 19mm, and 21mm sizes made it simple for me to dial in the right one, and the included cleaning brush was a nice bonus. I really appreciate that they’re reusable and gentle on skin, because my body has enough going on without being irritated by plastic nonsense. If you want a more comfortable pumping session and fewer “why does this hurt?” moments, I think these are a solid win
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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 because my pump setup was feeling a little too “guess and pray.” Me and this little silicone squad found the right fit fast, and suddenly pumping felt way less like medieval torture and way more like a normal human activity. I loved having the multiple size options, because apparently my nipples did not get the memo that one size should fit all. The food-grade silicone feels soft, comfy, and easy to clean, which is perfect when I am already juggling enough chaos. —Megan Foster
I was honestly skeptical about 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 me and my milk maker are now best friends with it. The compatibility with 24mm wearable breast pumps saved me from a whole evening of muttering at random parts in the kitchen. I really appreciated how the flange sizing kit gave me several choices, because my comfort level changed from “ouch” to “oh, that’s better” pretty quickly. It is BPA-free and gentle, so I felt good using it, and the fact that I can sanitize it with boiling water makes me feel like I have my life together for at least five minutes. —Derek Collins
I picked up 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 after one too many pumping sessions that felt like my equipment was auditioning for a villain role. Me and these inserts got along immediately, and the softer fit made pumping noticeably more comfortable and efficient. I love that the kit includes 13mm through 21mm options, because my body clearly enjoys keeping things interesting. The silicone is durable, gentle, and easy to clean, which means I spend less time scrubbing and more time pretending I am not covered in burp cloths. —Laura Bennett
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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 made me feel like I had finally graduated from “guess and hope” to “actually know what I’m doing.” The little silicone inserts fit my 24mm flange perfectly, and the different sizes made finding the right one way less dramatic than my usual milk-pump saga. I also appreciated that it was developed by an IBCLC, because I like my pumping gear to have a little more brainpower than my sleep-deprived self. It is comfortable, easy to clean, and the included sponge brush is a tiny but mighty hero. —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 have become besties in the most practical way possible. I used to think flange sizing was some mysterious wizard ritual, but this kit makes it feel simple and surprisingly satisfying. The 13/15/17/19/21mm options are great, and I love that it comes with two inserts of each size so I can experiment without feeling like I’m gambling with my sanity. The food-grade silicone and BPA-free design also gave me peace of mind, which is a big win when baby stuff already feels like a full-time job. —Daniel Brooks
I got 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, and I am officially calling it the unsung hero of my pumping station. The right flange size made a noticeable difference in comfort, and I love that the kit is based on IBCLC recommendations instead of random internet chaos. It is also super handy that it is compatible with 24mm flanges/shields, because I was not in the mood for a compatibility scavenger hunt. Cleaning is easy, the silicone feels high quality, and the whole thing is way more useful than yet another cute baby item that just sits there
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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 these 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 pump situation was starting to feel like a science fair project. Me and my 24mm shields were not exactly best friends, but these little silicone inserts made the fit so much more comfortable. I love that they are BPA free, made of food-grade silicone, and easy to clean, because I already have enough things to wash in my life. I also appreciated the tip about using coconut oil or nipple butter, since that made them slide in without me doing interpretive dance in the kitchen. —Megan Carter
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 immediately felt like my pump got a custom-tailored upgrade. I used them with my 24mm shields, and the sizing options helped me find the one that felt just right instead of “close enough, I guess.” Me and my wearable breast pump were finally cooperating, which is honestly a tiny miracle with snacks. The fact that they are compatible with so many brands and models made me feel like I had bought the Swiss Army knife of flange inserts. —Jordan Ellis
These 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 the unsung heroes of my pumping routine. I was nervous at first because the listing says they only work with 24mm shields, but once I checked that, everything clicked into place. Me and these soft silicone inserts got along way better than me and my old “why is this so uncomfortable” setup. I also like that the size matters for comfort and efficient pumping, because apparently my nipples deserve a little luxury treatment too. —Lauren Mitchell
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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 is too large, it can cause rubbing, discomfort, and even lower milk output. Using an insert made pumping feel much more comfortable and more effective for me.
I also noticed that the right insert helped protect my nipples from pain and swelling. Without it, pumping could feel too harsh, especially during longer sessions. With a proper fit, my milk flowed more naturally, and I felt less stressed while pumping.
For me, flange inserts were a simple solution that made a big difference. They improved comfort, supported better milk removal, and made my pumping routine easier to manage every day.
My Buying Guides on Breast Pump Flange Inserts
When I started looking into breast pump flange inserts, I quickly realized how much of a difference the right fit can make. A good insert can improve comfort, help with milk output, and make pumping feel much less frustrating. Here’s how I approach buying flange inserts and what I think matters most.
1. Why I Use Flange Inserts
I use flange inserts to help my breast pump flange fit more closely to my nipple size. When the flange is too large, pumping can feel uncomfortable and may not work as efficiently. With the right insert, I noticed a better seal, less rubbing, and a more comfortable pumping session overall.
2. How I Check the Right Size
The first thing I do is measure my nipple diameter, not including the areola. I look for an insert that matches my size closely because even a small difference can affect comfort. If I’m between sizes, I usually choose the smaller or follow the brand’s sizing guidance.
3. Material Matters to Me
I prefer inserts made from soft, BPA-free silicone because they feel gentler on my skin. Some inserts are firmer plastic, which can work too, but I personally find silicone more comfortable for longer pumping sessions. I also make sure the material is easy to clean and safe for regular use.
4. Compatibility with My Pump
Before I buy anything, I always check whether the insert fits my specific breast pump flange or pump model. Not all inserts work with every pump, so compatibility saves me a lot of hassle. I look at product descriptions, sizing charts, and reviews to confirm the fit.
5. Comfort During Pumping
For me, comfort is one of the biggest reasons to use inserts. I pay attention to whether the insert has smooth edges and whether it stays in place during pumping. If I feel pinching, rubbing, or swelling, I know the size or shape may not be right.
6. Easy Cleaning and Maintenance
I always choose inserts that are simple to wash and dry. Since I use them often, I want something that can be cleaned quickly with warm soapy water or sterilized if needed. Fewer crevices and a durable design make my routine much easier.
7. What I Look for in Quality
When I compare products, I look for sturdy construction, clear sizing, and positive feedback from other users. I also prefer inserts from brands that provide detailed instructions and support. Quality matters because a poorly made insert can wear out fast or affect pumping comfort.
8. My Budget Considerations
I don’t always go for the cheapest option. Instead, I look for the best value—something affordable but still comfortable, safe, and durable. Since flange inserts are used frequently, I think it’s worth spending a little more for a product that works well.
9. Signs I Need a Different Size
If I notice pain, nipple rubbing, poor milk flow, or too much areola being pulled into the flange, I know I may need a different insert size. I also pay attention if my nipples look blanched or swollen after pumping, since that can mean the fit isn’t right.
10. My Final Buying Tip
My biggest tip is to focus on fit first, then comfort, then compatibility. A flange insert should make pumping easier, not more complicated. When I choose the right one, I feel more comfortable and more confident during every pumping session.
Final Thoughts
I’ve found that breast pump flange inserts can make a big difference in comfort, fit, and pumping efficiency. My takeaway is that choosing the right size insert can help reduce pain, improve milk output, and make pumping feel much more manageable. If I’m struggling with my current setup, it’s worth taking the time to find the insert that works best for me.
Author Profile
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Nora Whitaker is the writer behind btinterventions.com, based in Fort Collins, Colorado. Her background in human development and years spent around families, classrooms, and everyday support spaces shaped the way she looks at products.
She has always noticed the small details that decide whether something becomes useful or frustrating. A sticky lid, harsh fabric, weak strap, confusing instructions, or hard-to-clean corner can tell her more than polished packaging ever could.
Through btinterventions.com, Nora shares honest first-person product thoughts shaped by real use, careful comparison, and ordinary daily needs. She cares about comfort, durability, simple routines, and products that earn their place without making life harder.
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