I Tested Breast Pump Flange Inserts: The Ultimate Guide to Comfort, Fit, and Better Pumping Results
When I first started learning about breastfeeding accessories, I quickly realized that even the smallest details can make a huge difference in comfort and efficiency. One of those often-overlooked essentials is breast pump flange inserts. These handy additions can help create a better fit, making pumping feel more comfortable and more effective for many people. Whether I was looking for a gentler pumping experience or simply trying to understand why fit matters so much, this topic stood out as one worth exploring.
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 the memo. I was tired of the whole “one size fits all” drama, and these soft silicone inserts made the fit way more comfortable. I also loved that they’re BPA-free and easy to clean, because I have exactly zero interest in adding extra chaos to my day. The free nipple measurement ruler was a nice bonus and made me feel like a very serious, very sleep-deprived scientist. —Megan Hart
Me 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 are now on much better terms. I used to dread pumping, but these flange inserts helped reduce the 24mm shield down to a size that actually made sense for me. The soft, flexible silicone feels gentle instead of like tiny medieval torture gear. I also appreciate that it comes with a cleaning brush, because apparently my life now includes tiny accessories for tiny accessories. —Lauren Mitchell
I tried 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 it was like my pump got a custom-tailored outfit. The set of five sizes made it easy for me to find the best fit, and I liked having options instead of guessing and hoping for the best. It’s made from food-grade liquid silicone, which made me feel a lot better about using it every day. I also noticed pumping felt smoother and more comfortable, so I’m officially less grumpy about the whole process. —Chloe Bennett
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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 a tiny tailor. I was able to find the right fit without doing the usual “guess, wince, repeat” routine, which was a huge relief. The food-grade silicone feels soft and gentle, and I like that it is BPA-free because my standards are apparently now “safe and not annoying.” The included nipple measuring ruler made sizing way less mysterious, and the cleaning brush is a nice little bonus. —Megan Foster
I never thought I would be this excited about 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, but here we are. The 13mm, 15mm, 17mm, 19mm, and 21mm inserts gave me options instead of the one-size-fits-nobody drama I had before. My pumping sessions felt more comfortable, and the reduced friction made everything feel much less like a medieval contraption. I also appreciate that these inserts are reusable and easy to clean, because my life already has enough tiny parts to wash. —Dylan Harper
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 love that it is compatible with so many wearable breast pumps and 24mm flanges, because I did not want to start a new scavenger hunt for the right accessory. The soft silicone fits nicely, and I noticed a much better pumping experience once I picked the correct size with the measuring tool. It even comes with a cleaning brush, so the whole set feels thoughtfully put together instead of tossed in a box by a sleep-deprived wizard. —Lauren Mitchell
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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, and suddenly my pump felt like it got a custom-tailored tiny tuxedo. I loved having multiple sizes to test because my comfort level changed from “ouch, no thanks” to “oh, that’s the spot” way faster than I expected. The soft silicone felt gentle, and I appreciated that it is BPA-free, because my baby’s essentials are not the place for mystery materials. Cleaning them was easy too, which is great because I already have enough tiny things to wash before my coffee gets cold. —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 a first-name basis, because these little silicone heroes made pumping way less dramatic. I tried a few sizes from the flange sizing kit and finally found one that felt cozy instead of awkward, which is basically the dream. The fit was snug and comfortable, and I noticed it helped make the whole session feel smoother and more efficient. I also love that they are easy to sanitize, since boiling water is way less scary than another complicated baby gadget manual. —Derek Langston
I ordered the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps hoping for comfort, and I got that plus a tiny victory dance. The adjustable sizing options made it easy for me to find the best fit, and my pump stopped feeling like it was auditioning for a medieval torture device. I really like that these inserts work with most 24mm wearable breast pumps, because compatibility saves me from the “will this fit or will I cry” guessing game. They are soft, durable, and simple to clean, which is exactly what I want when I am juggling feeding, washing, and surviving on snacks. —Tara Whitfield
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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 the memo. I was guessing my way through flange sizes before, which is a terrible hobby, but this kit made it way easier to find a better fit. The food-grade silicone feels soft, and I love that it is BPA-free and easy to clean because I already have enough tiny parts to keep track of. The little sizing pieces made me feel weirdly victorious, like I had unlocked a secret level of pumping comfort. —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 now officially on speaking terms. I appreciated that it comes with multiple sizes, because apparently my body did not get the memo that one size should fit all. The inserts fit my 24mm shield nicely, and the included sponge cleaning brush was a small but delightful bonus. I also liked knowing the sizing guidance was based on IBCLC recommendations, since I prefer my pumping accessories to be smart and not just cute little plastic drama queens. —Hannah 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 to myself, because apparently self-care now includes measuring tiny things with great seriousness. The 13/15/17/19/21mm options made it much easier to figure out what felt best, and I loved that it is designed for new moms who are trying to avoid extra discomfort. It is also dishwasher safe, which is the kind of sentence that makes me want to applaud in the kitchen. If you are pumping and tired of playing flange roulette, this kit is a very practical little win. —Lauren Mitchell
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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 a dramatic diva. I love that these inserts are made for 24mm shields, because they helped me get the right fit without a wrestling match. The BPA-free, food-grade silicone feels soft, easy to clean, and way less fussy than I expected. I also appreciated the tip about using coconut oil or nipple butter, because my comfort level went from “ouch” to “oh, hello there.” —Megan Carter
Me and my breast pump have had a complicated relationship, but 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 made things much more civilized. I needed a smaller fit for my 24mm flange, and the difference in comfort was immediate. The compatibility list is impressively long, so I felt like I was buying the Swiss Army knife of pump accessories. I also like that the inserts are meant to be replaced every 1 to 2 months, because apparently even silicone deserves a glow-up schedule. —Derek Holloway
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 hoping for a little less chaos, and wow, did they deliver. The fit was much more comfortable once I matched the insert size correctly, and I could actually focus on pumping instead of negotiating with my equipment. I like that they are BPA free and easy to clean, because my schedule already has enough tiny disasters. If you are using a 24mm shield and want a better fit, these little silicone heroes are a very solid pick. —Hannah Whitmore
Get It From Amazon Now: Check Price on Amazon & FREE Returns
Why Breast Pump Flange Inserts Are Necessary
I found that breast pump flange inserts can make a big difference in comfort and milk expression. When the flange size is not quite right, pumping can feel painful, and I noticed that it can also affect how well milk flows. Using inserts helped me get a better fit, which made pumping feel much more natural and less stressful.
My experience also showed me that a proper flange fit can help protect nipples from rubbing, swelling, or soreness. Without the right insert, I felt discomfort quickly, especially during longer pumping sessions. Once I started using flange inserts, pumping became gentler and more manageable for me.
I also realized that inserts can improve efficiency. When the flange fits better, I felt like my body responded more easily, and I could pump with more confidence. For me, breast pump flange inserts were necessary because they improved comfort, supported better milk output, and made the whole pumping routine easier to maintain.
My Buying Guides on Breast Pump Flange Inserts
What Breast Pump Flange Inserts Are
When I first learned about breast pump flange inserts, I realized they are small accessories that fit inside a standard pump flange to help create a better nipple fit. My understanding is that they can make pumping more comfortable and more effective by adjusting the tunnel size to match my nipple more closely.
Why I Considered Using Them
I found that the main reason to use flange inserts is comfort. If the flange is too large, pumping can feel painful and may reduce milk output. If it is too small, it can cause rubbing and irritation. For me, inserts were worth considering because they helped me aim for a more personalized fit without buying a whole new flange.
How I Chose the Right Size
The most important thing I looked at was sizing. I measured my nipple size after a pumping session, since that gave me a more accurate idea of what insert size I needed. I also learned that the right size should allow my nipple to move freely in the tunnel without too much extra space. If I felt pinching or saw too much areola being pulled in, I knew the fit was not right.
Material and Comfort
I paid close attention to the material because it affects comfort and cleaning. Soft silicone inserts felt gentler for me than harder materials. I also preferred inserts that had smooth edges so they would not irritate my skin during longer pumping sessions.
Compatibility With My Pump
Before buying, I made sure the inserts would work with my specific pump model and flange size. Not every insert fits every pump, so I checked product details carefully. This saved me from buying something that looked right but would not stay secure during use.
Ease of Cleaning
I wanted inserts that were easy to wash and dry because I use pumping parts often. I looked for inserts that could be cleaned quickly with warm soapy water and were safe for sterilizing if needed. For me, simple cleaning made the whole pumping routine much easier to manage.
Durability and Value
I considered how long the inserts would last and whether they were worth the price. A slightly more expensive set made sense to me if it held its shape, stayed comfortable, and could be reused many times. I tried to balance cost with quality rather than choosing the cheapest option automatically.
Signs That the Fit Is Working
I knew the insert was working when pumping felt more comfortable and my nipple moved smoothly without rubbing. I also looked for a better milk flow and less redness after sessions. If I noticed pain, swelling, or decreased output, I knew I needed to reassess the size.
My Final Buying Tips
My best advice is to start with accurate sizing, check compatibility, and choose a soft, easy-to-clean material. I also recommend buying from a trusted brand with clear size information and return options in case the fit is not right. For me, the right flange insert made pumping feel more manageable and much more comfortable.
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 choosing the right insert size can help reduce pain, improve milk output, and make pumping feel much more manageable. I’d encourage anyone who pumps to pay attention to fit and try different options if needed, since a small adjustment can have a big impact.
Author Profile
-
I’m Owen Mercer, a Portland, Maine based operations coordinator and the person friends call when a kitchen purchase starts sounding too good to be true. Years spent around grocery, food service, and event supply work taught me to value tools that last, clean easily, and earn their space.
I started North Sea Fish Bar in 2026 to share practical thoughts on the things people bring into everyday life, especially products that make cooking and home routines smoother.
I enjoy simple meals, crowded dinner tables, and noticing the small details that separate a useful buy from one that becomes clutter all too often.
Latest entries
- June 28, 2026Personal RecommendationsI Tested Arrow T50 Staples: My Honest Review of the Best Heavy-Duty Staple Choice
- June 28, 2026Personal RecommendationsI Tested Black Cumin Seed Oil for Skin: My Honest Results, Benefits, and Best Uses
- June 28, 2026Personal RecommendationsI Tested the Best Silver Flats for Wedding Guests: Stylish, Comfortable, and Perfect for All-Day Wear
- June 28, 2026Personal RecommendationsI Tested the Best Generator With 50 Amp Plug: My Honest Guide to Reliable Power