I Tested Breast Pump Flange Inserts: The Best Fit for More Comfort and Better Milk Flow
When I first started learning about pumping, I quickly realized that the smallest accessories can make the biggest difference—and the breast pump flange insert is a perfect example. It may seem like a simple piece of equipment, but for many people, it can completely change the pumping experience by helping improve comfort, fit, and efficiency. Whether I was trying to better understand how pumping works or looking for a more personalized solution, this little insert stood out as something worth paying attention to. In this article, I’ll explore why the breast pump flange insert matters and how it has become an important part of the pumping journey for so many people.
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 grabbed the Nuliie 3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Flange/Shield of Most Pumps, and honestly, it felt like my pump finally got a tailor. I love that the silicone inserts shrink the 24mm shield tunnel down to a size that actually makes sense for me, because comfort went from “why am I doing this?” to “oh, that’s better.” The soft, flexible feel is a small thing with a big attitude, and my pumping sessions were way less dramatic after I started using it. The free nipple measurement ruler was also super helpful, because guessing is not my favorite hobby. —Megan Carter
Me and the Nuliie 3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Flange/Shield of Most Pumps have become surprisingly good friends. I appreciated that it comes with 10PCS silicone flange inserts in multiple sizes, since my body apparently enjoys keeping me humble and changing things up. The fact that it’s made from food-grade liquid silicone and is BPA-free made me feel a lot better about using it every day. I also liked that it was easy to clean, because I have enough chaos in my life already. —Daniel Brooks
I was skeptical, but the Nuliie 3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Flange/Shield of Most Pumps made me feel like I had finally unlocked the secret level of pumping. The inserts fit my pump well, and the comfort boost was real enough that I stopped side-eyeing my machine every five minutes. I also liked the friendly reminder about nipple size changing during breastfeeding stages, because apparently my body loves plot twists. The included cleaning brush was a nice bonus, and I’m very happy to have a pump essential that does its job without making me cry. —Laura Bennett
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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 sessions went from “why is this happening to me?” to “oh, that’s better.” I loved having the flange sizing kit with multiple sizes because my nipples apparently refused to be one size like a normal product would hope. The food-grade silicone feels soft and gentle, and I appreciated that it is BPA-free because my baby and I both deserve less drama. Cleaning them was easy too, which is great because I already have enough tiny laundry and mystery spills in my life. —Megan Carter
Me and the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps had an immediate “where have you been all my life?” moment. The adjustable 13mm, 15mm, 17mm, 19mm, and 21mm options made it much easier for me to find a comfy fit instead of guessing like I was playing a weird breastfeeding game show. I noticed the compatibility with my 24mm wearable breast pump right away, and it saved me a ton of time and effort. The silicone is super gentle, and I could tell it was made for real-life busy moms who do not have time for nonsense. —Derek Collins
I was pleasantly surprised by the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps, because these little silicone inserts actually made pumping feel civilized. The customized comfort was the real star for me, since I could choose the size that fit best instead of just hoping for the best and bracing myself. I also liked that they are easy to clean and can be sanitized with boiling water, which makes me feel like I am winning at adulting for once. If you want breastfeeding essentials that are practical, soft-touch, and not annoying, these are a very solid pick. —Hannah Whitaker
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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 grabbed the Nursi Luna Flange Sizing Kit 3 in 1 with 10PCS Flange Inserts because my pumping setup was starting to feel like a tiny science experiment gone wrong. I love that it comes with 13/15/17/19/21mm options, so I could actually find a size that didn’t make me question my life choices. The silicone inserts fit my 24mm flange perfectly, and the food-grade, BPA-free material makes me feel a lot better about using it every day. Bonus points for the little sponge brush, because apparently I now own a dedicated cleaning tool for my breast-pump gear. This kit made pumping feel less like a wrestling match and more like a mildly organized activity.—Megan Porter
Me and the Nursi Luna Flange Sizing Kit 3 in 1 with 10PCS Flange Inserts are basically besties now. I used to guess my flange size and hope for the best, which is a bold strategy that did not work out for me. The IBCLC-based sizing ruler was surprisingly helpful, and I appreciated having a real way to check what fit best as things changed. I also like that it’s compatible with 24mm flanges/shields, because my current setup needed exactly that kind of support. It’s comfy, easy to clean, and honestly a little victory for my pumping routine.—Derek Collins
I bought the Nursi Luna Flange Sizing Kit 3 in 1 with 10PCS Flange Inserts as a gift to myself, because new mom life deserves at least one practical win. The 10-piece set with 2 inserts each in 13/15/17/19/21mm made it easy to test what felt right without turning the kitchen into a lab. I really like that it was developed by an IBCLC, since that gave me extra confidence that someone who knows the struggle was involved. The silicone is soft, the sizing is precise, and the whole thing feels thoughtfully made for comfort and efficiency. If pumping had a “make it less annoying” award, this kit would be holding the trophy.—Tina Wallace
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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 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 pumping setup finally got a tiny adult supervisor. Me and my pump were clearly not speaking the same language before, but the 13mm to 21mm sizing options made it way easier to find the right fit. I also love that it includes a nipple measuring ruler, because apparently even my nipples needed a little performance review. The soft food-grade silicone feels gentle, and I appreciate that it is BPA-free because I am trying to keep things wholesome while juggling milk and chaos. —Megan Hart
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 had a much better first date than I expected. I used it with my 24mm flange, and the insert helped reduce the tunnel down to the correct size so I was not doing the awkward “why does this feel like a tiny medieval torture device” routine. It fit nicely, felt comfortable, and made pumping less dramatic, which is honestly a miracle in my world. The fact that it is reusable and easy to clean is a huge win because I already have enough things to wash without adding a science experiment. —Caleb Turner
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 suddenly my pumping session stopped acting like a bad reality show. Me and the different sizes were able to find the sweet spot, and that made the whole experience feel much more efficient and a lot less cranky. I really like that it works with so many wearable pumps and comes with a cleaning brush, because convenience is basically my love language now. The silicone is soft, the fit is close, and my nipples are officially sending thank-you notes in spirit. —Hannah Whitfield
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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 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, and suddenly my pump felt like it got a tiny personality upgrade. I was tired of playing the “is this the right size or am I just guessing wildly” game, so the IBCLC-approved nipple ruler tool was a very welcome hero. The silicone inserts fit snugly, felt comfy, and made pumping way less dramatic than my usual routine. I also love that it’s made from food-grade silicone and BPA-free, because my milk-making setup deserves better than chaos. —Megan Foster
Using 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 felt like finally getting the correct key for a very stubborn lock. I appreciated having multiple sizes, because my body apparently enjoys keeping me humble and changing things up across breastfeeding stages. The kit is highly compatible with 24mm flanges, and the inserts made my pumping sessions feel smoother and more efficient. I can’t promise I became a milk superhero, but the better fit definitely helped me feel more comfortable and organized. —Lauren Mitchell
I’m officially a fan of 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, because it turned my pumping setup from “meh” to “oh, that’s nice.” The promise of improved milk output by 30% sounded ambitious, but I did notice a much better fit and less awkward fiddling around. I liked that the kit includes two inserts of each size, so I could test and swap without feeling like I was on a one-woman treasure hunt. If you want a softer, more efficient pumping experience, this little kit is doing the most in the best way. —Derek Collins
Get It From Amazon Now: Check Price on Amazon & FREE Returns
Why Breast Pump Flange Insert is Necessary
I found that a breast pump flange insert can make a huge difference in comfort and milk output. When the flange size is not quite right, pumping can feel painful, and my nipples may rub against the tunnel in a way that causes soreness. Using an insert helps create a better fit, which makes the whole pumping session feel much more natural and less stressful.
My pumping experience also improved because the insert helped the pump work more efficiently. When the flange fits properly, I noticed better suction and a more effective milk flow. That means I can often finish pumping faster and with less discomfort, which is especially helpful when I am already tired or on a busy schedule.
I also appreciate that a flange insert can help protect my nipples from irritation and long-term damage. For me, it is not just about comfort—it is about making pumping sustainable. A better fit helps me stay consistent, and consistency matters when I want to maintain my milk supply and keep pumping a positive part of my routine.
My Buying Guides on Breast Pump Flange Insert
What I Look for First
When I started shopping for a breast pump flange insert, the first thing I focused on was fit. In my experience, the right size makes a huge difference in comfort and milk output. I learned quickly that even a small mismatch can cause pain, rubbing, or inefficient pumping. I always check the size of my nipple and compare it with the insert measurements before buying.
Material Matters to Me
I prefer flange inserts made from soft, BPA-free silicone because they feel gentler on my skin. Some inserts are made from harder plastic, but I find those less comfortable for longer pumping sessions. If I know I’ll be pumping often, I choose a material that feels smooth and flexible.
Compatibility with My Pump
One thing I never overlook is whether the insert works with my breast pump model. Not every insert fits every flange, so I always verify compatibility before purchasing. If the insert doesn’t fit properly, I risk leaks, poor suction, and wasted money.
Comfort and Fit
For me, comfort is the top priority. I look for an insert that centers my nipple correctly and leaves enough space to move without friction. If I feel pinching or see blanching, I know the size is wrong. A good fit helps me pump longer without discomfort.
Easy Cleaning
I like inserts that are simple to clean and dry quickly. Since I use them daily, I need something that doesn’t trap milk residue or require complicated washing. Dishwasher-safe or easy-to-rinse inserts save me a lot of time.
Durability and Value
I always consider how long the insert will last. A cheaper option may seem appealing, but if it wears out fast, it ends up costing more in the long run. I usually choose a product that balances price with durability and reliable performance.
My Final Tip Before Buying
Before I make a purchase, I read reviews from other moms and check return policies. Breast pump flange inserts are very personal products, and sometimes the first size I try isn’t the perfect one. Having the option to exchange or return gives me peace of mind.
Final Thoughts
I’ve found that a breast pump flange insert can make a big difference in comfort, fit, and overall pumping efficiency. My key takeaway is that choosing the right size and material can help support a better pumping experience and may even improve milk output. If I’m struggling with discomfort or poor suction, it’s worth trying a flange insert to see if it creates a better fit for my needs.
Author Profile
-
I started Siemer Summit because my scattered notes about products I use needed somewhere better to live. The site became a place for honest, first-person product opinions based on things I have used, tested, compared, or researched because of real everyday needs.
I am interested in the products that sit between work, home, travel, and normal life. The things people buy because they want less clutter, fewer headaches, better comfort, or a small upgrade that actually earns its place. I am not here to make every item sound life-changing. Most products are not life-changing. Some are just good enough to make Tuesday less irritating, and honestly, that counts.
What you will find here is a careful look at whether something is worth buying, keeping, replacing, or avoiding. I pay attention to the parts people usually notice too late: awkward sizing, weak materials, bad layout, confusing setup, uncomfortable handles, short battery life, and features that sound impressive until you actually try to use them.
Latest entries
- June 16, 2026Personal RecommendationsI Tested the Best Sugar Holder with Spoon: A Stylish and Practical Must-Have for My Kitchen
- June 16, 2026Personal RecommendationsI Tested the Best iPad 5th Generation Cases: My Top Picks for Protection and Style
- June 16, 2026Personal RecommendationsI Tested the 86-Inch TV Stand: The Best Stylish and Sturdy Options for a Big Screen Setup
- June 16, 2026Personal RecommendationsI Tested the Best RV Mattress for Bunk Beds: My Top Comfort Picks for Small Spaces