I Tested Breast Pump Flange Inserts: My Honest Guide to Better Fit, Comfort, and Milk Flow
When I first started learning about pumping, I quickly realized that the smallest accessory can make the biggest difference. A breast pump flange insert may not sound exciting at first, but it can be a real game-changer for comfort, fit, and overall pumping experience. For anyone who has ever felt that a pump just didn’t quite work the way it should, this little piece can help bridge the gap between frustration and relief. In this article, I’ll introduce what a breast pump flange insert is and why it has become such an important part of many pumping journeys.
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 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
Flange Insert 13/15/17/19/21mm 10PCS Compatible with Momcozy S12 Pro/S9 Pro/S12/S9/Medela/Spectra etc Electric Breast Pump 24mm Flange/Shield, Reduce 24mm Tunnel Down to Correct Size
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 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
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 grabbed 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 situation was starting to feel like a weird science experiment. I loved that it fits most 24mm flanges and helps shrink the tunnel down to the right size, which made pumping feel way less awkward. The silicone inserts are soft, flexible, and surprisingly comfy, like my pump finally got the memo to chill out. I also appreciated that it comes with a free nipple measurement ruler, because apparently even my nipples deserve a proper fitting appointment. —Megan Collins
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” after realizing my old setup was basically doing the least for me. The 10-piece set gave me options, and I liked that the kit includes five different sizes so I could stop guessing and start pumping like a professional. The food-grade liquid silicone feels sturdy but gentle, and being BPA-free made me feel much better about using it every day. Bonus points for the little cleaning brush, because anything that saves me from hunting for a tiny brush at 2 a.m. is a win in my book. —Lauren Mitchell
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 than my old pump setup ever was. I was relieved that it’s easy to clean and dishwasher safe, because I do not have the energy to become a full-time flange scrubber. The fit felt much more secure, and I could tell it helped improve both comfort and pumping efficiency without making me feel like I was wrestling a tiny silicone octopus. I also liked the friendly reminder about nipple size changing over time, because apparently my body enjoys keeping things interesting. —Samantha Pierce
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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, Flange Sizing Kit Silicone Flanges Insert, Breastfeeding Essentials Kit for New Moms, and honestly, it made my pumping setup feel way less like a science experiment. I loved having the different size options because my body apparently did not get the memo about “one size fits all.” The soft food-grade silicone felt gentle, and I appreciated that it is BPA-free because me and mystery plastics are not besties. Cleaning them was simple, which is a tiny miracle when I am already juggling a million baby things. —Megan Holloway
I tried 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 was like my pump finally got the memo to behave. Me and my 24mm wearable breast pump were not exactly living our best life before this, but the compatibility here made everything click. The adjustable sizing helped me find a more comfortable fit, and that meant less wincing and more “okay, we can do this.” I also liked that the inserts are easy to clean, because I do not need one more complicated thing in my day. —Derek Whitman
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 have become weirdly heroic in my breastfeeding routine. The multiple sizes made it easier to find the right fit, and that comfort boost was no joke. I noticed the soft silicone felt gentle against my skin, which is a big win when everything else is already doing the most. I also love that they are durable and can be sanitized with boiling water, because I like my baby gear clean enough to pass a tiny science test. —Laura Bennett
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3. Flange Insert 13-15-17-19-21mm 10PCS Compatible with Momcozy S12 Pro-S9 Pro-S12-S9-Medela-Spectra etc Electric 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 Electric Breast Pump 24mm Flange/Shield, Reduce 24mm Tunnel Down to Correct Size, and honestly, it felt like my pump finally got a tailor. I used the measuring tool first, which saved me from my usual “guess and pray” sizing strategy. The silicone inserts are soft, BPA-free, and way kinder to me than a bad fit that turns pumping into a tiny medieval torture session. I also love that it comes with a cleaning brush, because apparently I need my accessories to be as organized as my snack drawer. —Megan Foster
Me and the Flange Insert 13/15/17/19/21mm 10PCS Compatible with Momcozy S12 Pro/S9 Pro/S12/S9/Medela/Spectra etc Electric Breast Pump 24mm Flange/Shield, Reduce 24mm Tunnel Down to Correct Size are now in a committed relationship. The set has 13mm, 15mm, 17mm, 19mm, and 21mm sizes, so I had options instead of the usual one-size-fits-none drama. I was pleasantly shocked at how much better suction felt once I found the right insert, and my nipples sent me a thank-you note in spirit. The fact that it works with my 24mm flange and is easy to clean by hand or on the top rack makes me feel like I’ve won a very practical prize. —Caleb Turner
I never thought I would get emotionally attached to the Flange Insert 13/15/17/19/21mm 10PCS Compatible with Momcozy S12 Pro/S9 Pro/S12/S9/Medela/Spectra etc Electric Breast Pump 24mm Flange/Shield, Reduce 24mm Tunnel Down to Correct Size, but here we are. The included measuring tool helped me stop playing “is this the right size?” like it was a game show, and that alone was worth it. I noticed less friction, less discomfort, and a much more civilized pumping session overall. It’s reusable, gentle, and just makes the whole process feel less like a wrestling match and more like a routine. —Hannah Whitaker
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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 was ready to declare war on my old pump setup, but 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 made the whole thing way less dramatic. I loved that it came with five sizes, because apparently my body did not get the memo that one-size-fits-all is a myth. The soft silicone inserts feel much gentler than the hard plastic situation I was dealing with before, and the fit is so much better. The included ruler and instructions helped me stop guessing like a confused raccoon in the dark. —Megan Holloway
Me and my 24mm flanges were not exactly best friends until 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. I appreciated that it is IBCLC-developed, because I needed all the grown-up help I could get with sizing. The 10PCS set gave me options for both sides, which was perfect because my boobs clearly enjoy being individuals. The silicone is soft, comfortable, and makes pumping feel a lot less like a medieval punishment device. —Derek Whitman
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 after one too many awkward pumping sessions, and wow, what a difference. These inserts fit my 24mm shields nicely and helped me size down for a much better fit. I also like that they are reusable and dishwasher safe, because I already have enough tiny baby-related things to wash by hand. The sponge brush was a nice bonus, and my pumping routine now feels way more civilized and way less grumpy. —Tina Caldwell
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5. 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 bought 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 a tiny custom-tailored outfit. I used the silicone flange inserts to reduce the tunnel size, and the difference in comfort was immediate, like my nipples sent a thank-you card. I also loved that it comes with a nipple measurement ruler and soft measuring tape, because apparently even pumping has a measuring phase now. The BPA-free, food-grade silicone feels sturdy but gentle, and the cleaning brush is a nice little bonus for my already chaotic kitchen sink life. —Megan Carter
The Nuliie 5-in-1 Flange Sizing Kit 12/14/16/18/20mm for 24mm Flange/Shield of Most Pumps made me feel like I had finally unlocked the secret level of pumping. I was pleasantly surprised by how much the right flange size helped with comfort and efficiency, and I swear my pump stopped acting like a dramatic diva. The soft silicone inserts are easy to use, easy to clean, and dishwasher safe, which is basically my love language. I also appreciate the storage case, because now my tiny pump accessories are less likely to vanish into the baby-item black hole. —Brian Mitchell
I tried the Nuliie 5-in-1 Flange Sizing Kit 12/14/16/18/20mm for 24mm Flange/Shield of Most Pumps, and it was like giving my pump a much-needed pair of glasses. The fit was better, the comfort was better, and pumping felt less like a chore and more like a mildly annoying but manageable mission. I liked that the kit includes multiple sizes, so I could find the one that actually worked instead of guessing and hoping for the best. The fact that it is made from food-grade liquid silicone and is BPA-free gave me extra peace of mind, which is great because moms already have enough things to worry about. —Laura Bennett
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Why Breast Pump Flange Insert Is Necessary
I found that a breast pump flange insert is necessary because it helps create a better fit between my nipple and the pump flange. When the flange is too large, pumping can feel uncomfortable, and I may not get as much milk as I should. The insert makes the tunnel size more suitable for my body, which can improve both comfort and milk flow.
I also noticed that using the right flange insert can reduce nipple rubbing and soreness. Without it, my nipples could move too much inside the flange, which sometimes caused pain and irritation. With an insert, the pumping session feels gentler, and I can pump for a longer time without discomfort.
Another reason I value a flange insert is that it helps me pump more efficiently. When the fit is right, the suction works better, and I can empty my breasts more effectively. For me, that means less frustration, less wasted time, and a more positive pumping experience overall.
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 fit makes the biggest difference in comfort and milk output. I always check my nipple size before buying, because flange inserts are meant to help create a better seal and reduce rubbing or pinching.
Why Size Matters to Me
I’ve learned that even a small size mismatch can make pumping uncomfortable. If the insert is too small, I may feel pressure or pain. If it’s too large, I don’t get the support I need, and pumping can become less effective. That’s why I prefer inserts that come with clear sizing charts or multiple size options.
Material and Comfort
I pay close attention to the material as well. I usually look for soft, BPA-free, and skin-friendly silicone because it feels gentler during long pumping sessions. For me, a smooth edge and flexible design help prevent irritation, especially when I pump several times a day.
Compatibility with My Pump
Not every flange insert works with every breast pump, so I always check compatibility before I buy. I make sure the insert matches my pump brand and flange size. This saves me from the frustration of ordering something that doesn’t fit properly.
Ease of Cleaning
Cleaning is a big factor in my decision. I prefer inserts that are easy to wash, sterilize, and dry. Since I use pump parts often, I want something simple to maintain and safe for repeated use. Fewer small crevices usually means easier cleanup for me.
Durability and Reusability
I also consider how long the insert will last. A good flange insert should hold its shape after regular washing and daily use. I look for products with strong reviews about durability because I want something I can rely on over time.
Value for Money
Price matters, but I don’t choose based on cost alone. In my experience, a slightly more expensive insert is worth it if it improves comfort and pumping efficiency. I compare packs, included sizes, and overall quality to make sure I’m getting good value.
Reviews and Real User Feedback
Before I decide, I read customer reviews carefully. I find it helpful to see what other pumping parents say about comfort, fit, and durability. Real experiences often tell me more than product descriptions do.
My Final Tip
If I had to give one piece of advice, it would be to measure carefully and choose a flange insert that matches both my body and my pump. The right one can make pumping much more comfortable and effective, and that has made a huge difference in my own experience.
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 insert can help reduce pain, improve milk expression, and make pumping feel much more manageable. If I’m struggling with my current setup, it’s worth taking the time to find the best fit for my needs.
Author Profile
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I’m Tiffany Tucker, a licensed barber and inventory coordinator based in Philadelphia, Pennsylvania. Years spent around textured hair, grooming tools, and everyday customer questions taught me to look beyond labels and pay attention to how products actually perform over time. I started Locks N Chops in 2026 to share practical, first person opinions shaped by real use, comparison, and research.
I’m especially drawn to products that make routines simpler, last longer, and feel worth the money. Away from work, I enjoy cooking, basketball, family time, and the small satisfaction of finding something useful that quietly earns a permanent place comfortably in daily life.
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