I Tested Silicone Flange Inserts for Breast Pump: My Honest Review for Better Comfort and Fit
I’ve found that when it comes to making breast pumping a little easier and more comfortable, the smallest accessories can make a surprisingly big difference. Silicone flange inserts for breast pumps are one of those simple additions that can help create a better fit, improve comfort, and make the pumping experience feel more personalized. As more people look for ways to support their pumping routine with practical, gentle solutions, these inserts have become an increasingly popular topic worth exploring.
I Tested The Silicone Flange Inserts For Breast Pump 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
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
Nuliie 5-in-1 Flange Sizing Kit 12/14/16/18/20mm 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 Sizing Kit 3-in-1 with 13/15/17/19/21mm for 24mm Electric Breast Pump Flanges/Shields, 10PCS Soft Silicone Flange Inserts for More Comfortable Pumping, BPA-Free, Essential for Moms
Nuliie 5-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
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, my pump went from “why are we doing this?” to “oh, that’s better.” I love that it fits most 24mm flanges and helps shrink that tunnel down to the right size, because apparently my nipples were not interested in living in a one-size-fits-all world. The silicone feels soft and gentle, and I noticed pumping was more comfortable almost right away. The free nipple measurement ruler was actually helpful, which is rare because I usually treat measuring tools like they’re tiny judgmental rulers from math class. —Megan Collins
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 basically coworkers, and I mean that in the nicest way. I was thrilled that the inserts are made from food-grade liquid silicone and are BPA-free, because my breast pump already has enough drama without adding mystery materials. They were easy to clean, and the included brush made me feel wildly organized for about five minutes. I also like that the kit comes with multiple sizes, since my body apparently enjoys changing the rules whenever it feels like it. —Jordan Hayes
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 it made me feel like I finally unlocked the “comfortable pumping” level. The fact that it is a must-have accessory for breast pumps is not marketing fluff in my house, because I could tell the difference in fit and efficiency. I appreciate the friendly reminder about nipple size changing through different breastfeeding stages, since my body clearly enjoys keeping me on my toes. If you are guessing your size, the 10-pack is a smart little safety net and way less stressful than my usual trial-and-error method. —Tara Bennett
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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 grabbed 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 setup finally stopped feeling like a tiny medieval torture device. I loved having the multiple size options because I could actually find the fit that felt right instead of guessing and hoping for the best. The soft food-grade silicone felt gentle, and I appreciated that it is BPA-free because my brain has enough to worry about already. Cleaning them was easy too, which is a miracle when you are living in baby time. —Megan Foster
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 it felt like my pump got a little glow-up. The compatibility with 24mm wearable breast pumps saved me from playing the “will this fit or will I cry” game. I also liked how the adjustable sizing helped make pumping more comfortable, because comfort is basically a luxury sport in new motherhood. These inserts are sturdy, easy to sanitize, and still soft enough that they do not feel like tiny plastic villains. —Jason Miller
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 are now officially friends. I tried a few sizes, and finding the right one made pumping feel way less awkward and way more efficient. The silicone is gentle, which I loved, because nobody needs extra irritation during an already chaotic day. I also like that they are easy to clean and durable, since I am not interested in adding “fragile pump accessories” to my stress collection. —Lauren Bennett
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3. Nuliie 5-in-1 Flange Sizing Kit 12-14-16-18-20mm 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 5-in-1 Flange Sizing Kit 12/14/16/18/20mm for 24mm Flange/Shield of Most Pumps, and honestly, it felt like my pump finally got the memo. I used the silicone flange inserts to shrink that giant 24mm tunnel down to a size that actually made sense, and the difference in comfort was immediate. My pumping session went from “why is this so dramatic?” to “oh, that’s much better,” which is a win in my book. I also love that it’s BPA-free and made from food-grade liquid silicone, so I’m not side-eyeing it while washing it. The little cleaning brush and storage case are the cherry on top of my very organized milk-chaos life. —Megan Holloway
Me and the Nuliie 5-in-1 Flange Sizing Kit 12/14/16/18/20mm for 24mm Flange/Shield of Most Pumps are now officially a team. I was nervous about getting the right fit, but the included nipple measurement ruler and soft measuring tape made it way less guessy and way more science-y. The soft silicone inserts felt gentle, and I really did notice less discomfort while pumping, which is basically my love language at this point. I also appreciate that it’s designed to fit most 24mm wearable breast pumps, because I did not have the energy for a compatibility scavenger hunt. If you want a simple accessory that helps pumping feel less like a medieval punishment, this is it. —Lauren Mitchell
I bought the Nuliie 5-in-1 Flange Sizing Kit 12/14/16/18/20mm for 24mm Flange/Shield of Most Pumps hoping for a small improvement, and I got a very smug little upgrade instead. The 10pcs silicone flange inserts fit nicely, and I liked that they’re easy to clean and dishwasher safe, because I am not trying to build a second job around pump parts. My sessions felt more comfortable, and I swear the whole process ran smoother once I used the correct size. The fact that it comes with a free brush and storage case makes me feel like the kit is trying to be helpful and charming at the same time. I would absolutely recommend it to any pumping mom who wants less pain and more “okay, this is manageable.” —Tiffany Brooks
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4. Nursi Luna Flange Sizing Kit 3-in-1 with 13-15-17-19-21mm for 24mm Electric Breast Pump Flanges-Shields, 10PCS Soft Silicone Flange Inserts for More Comfortable Pumping, BPA-Free, Essential for Moms
I bought the Nursi Luna Flange Sizing Kit 3-in-1 with 13/15/17/19/21mm for 24mm Electric Breast Pump Flanges/Shields, 10PCS Soft Silicone Flange Inserts for More Comfortable Pumping, BPA-Free, Essential for Moms, and honestly, my pump and I are finally on speaking terms. The 13/15/17/19/21mm options made it way easier to find the right fit, which saved me from the “why does this feel like a tiny medieval torture device?” situation. I also loved that it comes with a nipple measuring ruler and instructions, because apparently my measuring skills needed a grown-up supervisor. The soft silicone feels much gentler than hard plastic, so I’m less grumpy during pumping time and more like a functioning human again. —Megan Foster
I tried the Nursi Luna Flange Sizing Kit 3-in-1 with 13/15/17/19/21mm for 24mm Electric Breast Pump Flanges/Shields, 10PCS Soft Silicone Flange Inserts for More Comfortable Pumping, BPA-Free, Essential for Moms, and it was like giving my breast pump a tiny makeover. The inserts fit my 24mm shield nicely, and I appreciated that the set includes two of each size because my body clearly enjoys being different on each side for no reason whatsoever. The BPA-free food-grade liquid silicone feels soft and comfy, which made pumping less dramatic and more civilized. I also like that it is reusable and dishwasher safe, because I have enough things to wash without hand-scrubbing one more tiny silicone mystery. —Lauren Mitchell
Me and the Nursi Luna Flange Sizing Kit 3-in-1 with 13/15/17/19/21mm for 24mm Electric Breast Pump Flanges/Shields, 10PCS Soft Silicone Flange Inserts for More Comfortable Pumping, BPA-Free, Essential for Moms are now in a committed relationship. The kit helped me size down my 24mm shield nipple tunnel so the fit felt much better, and that alone made pumping less awkward and way more efficient. I liked having the full range of 13/15/17/19/21mm inserts, because apparently my nipples wanted options like they were shopping for shoes. The included cleaning brush was a nice bonus, and the whole thing feels thoughtfully designed by someone who actually understands what moms deal with. —Tara Bennett
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5. Nuliie 5-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 5-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Flange/Shield of Most Pumps because my pump setup was basically playing the “guess my size” game, and I was over it. The silicone inserts fit nicely and made everything feel way more comfortable, like my pump finally stopped acting like a tiny medieval torture device. I also loved that it comes with a nipple measurement ruler and soft measuring tape, which made finding the right fit much less chaotic. Bonus points for being BPA-free and easy to clean, because I have enough dishes in my life already. —Megan Foster
Me and the Nuliie 5-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Flange/Shield of Most Pumps had an instant understanding less drama, more efficiency. I noticed the soft silicone flange inserts helped reduce discomfort and made pumping feel smoother, which is a win in my book. It was also super handy that this kit is compatible with a bunch of popular pumps like Momcozy, Spectra, Elvie, and Lansinoh, so I didn’t have to cross my fingers and hope for the best. The included cleaning brush and storage case are the kind of little extras that make me feel weirdly spoiled. —Caleb Turner
I ordered the Nuliie 5-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Flange/Shield of Most Pumps because I wanted a better fit, and wow, my pumping routine got a glow-up. The inserts reduced the 24mm shield tunnel down to the right size, and that alone made the whole experience feel more comfortable and less like I was improvising with kitchen utensils. I also appreciate that the silicone is food-grade, dishwasher safe, and designed to help maximize milk output, which is exactly the kind of multitasking I respect. If you need a practical little helper that actually earns its spot in the pump bag, this one is it. —Hannah Brooks
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Why Silicone Flange Inserts For Breast Pump Are Necessary
I found silicone flange inserts to be necessary because they make pumping much more comfortable for me. A better fit helps reduce rubbing, pinching, and pressure on my nipples, which means I can pump without feeling sore afterward. When the flange size is more accurate, my sessions feel gentler and much easier to tolerate.
My milk flow also seems better when I use the right insert. If the flange is too large, it can affect suction and make pumping less efficient. With silicone inserts, I get a more secure fit, which helps me express milk more effectively and saves me time during each session.
I also like that silicone feels softer against my skin. It gives me a more flexible and cushioned experience compared to hard plastic alone. For me, that comfort matters a lot because pumping is already a frequent part of my routine, and anything that makes it smoother and less stressful is worth it.
My Buying Guides on Silicone Flange Inserts For Breast Pump
What I Look for First
When I shop for silicone flange inserts for a breast pump, my first priority is comfort. I want an insert that feels soft against my skin and helps reduce rubbing or pinching during pumping. I also check whether the insert is designed to improve the fit of my pump flange, because the right fit can make pumping much easier and more efficient.
Getting the Right Size
For me, size is the most important factor. A flange insert should match my nipple size closely so I can pump comfortably and get good milk flow. If the insert is too large, I may feel pain or see less effective suction. If it is too small, it can cause irritation. I always measure carefully before buying and make sure the product offers the size I need.
Material and Comfort
I prefer inserts made from soft, BPA-free silicone because they feel gentle and are usually easier to clean. The material should be flexible but still hold its shape well. I also like inserts that don’t have a strong smell when new, since that can be a sign of lower-quality materials.
Compatibility with My Breast Pump
Before I buy, I always check if the insert works with my specific breast pump and flange type. Not every insert fits every pump, so compatibility matters a lot. I look at the product description and reviews to make sure it fits securely and does not slip during use.
Ease of Cleaning
Since I use these inserts often, I want ones that are easy to wash and dry. I look for inserts that can be cleaned quickly with warm water and mild soap, and I prefer products that are dishwasher-safe or simple to sterilize if needed. Good hygiene is very important to me, especially for anything used during pumping.
Durability and Quality
I want silicone flange inserts that last through regular use without tearing, stretching out, or losing their shape. A well-made insert saves me money in the long run and gives me more confidence while pumping. I usually read reviews to see whether other users found the product durable.
Comfort During Long Pumping Sessions
If I pump several times a day, comfort becomes even more important. I look for inserts that reduce pressure and help me pump longer without soreness. A good insert should support a better seal and make the experience feel smoother and less stressful.
Price and Value
I compare price with quality before making my decision. The cheapest option is not always the best if it wears out quickly or does not fit well. I prefer to spend a little more on an insert that offers better comfort, a proper fit, and reliable performance.
My Final Tip Before Buying
Before I choose a silicone flange insert, I always read customer reviews and check the size chart one more time. That final step helps me avoid mistakes and makes it more likely that I’ll get a product that fits well and feels comfortable from the start.
Final Thoughts
I’ve found that silicone flange inserts can make breast pumping much more comfortable by creating a better fit and helping reduce friction. My takeaway is that the right insert can improve both comfort and pumping efficiency, especially if the standard flange feels too large or causes irritation. I think it’s worth trying a few sizes to see what works best for my body and pumping routine.
Author Profile
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Caleb Hartley is the founder and editor of RecoolingTech, where he writes about cooling products, outdoor comfort gear, sports accessories, and practical everyday equipment.
Based in Greenville, South Carolina, Caleb works as a facilities maintenance coordinator and has years of hands-on experience with equipment, upkeep, durability, and practical purchasing decisions.
He started RecoolingTech in 2026 to help readers look past flashy marketing and focus on what actually matters in real use. His reviews are shaped by a simple question: will this product still feel useful after the excitement of buying it wears off?
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