I Tested Different Flange Sizes for Breast Pumps: Here’s What Worked Best for Me
When I first started using a breast pump, I quickly realized that something as simple as the flange size could make a world of difference in comfort and efficiency. The flange—the part that fits over your breast—is more than just a piece of equipment; it’s a key factor in how well the pumping experience goes. Finding the right flange size can transform what might feel like a frustrating routine into a smoother, more effective process. In this article, I want to share why understanding and choosing the correct flange size matters so much for anyone navigating the world of breast pumping.
I Tested The Flange Size For Breast Pump Myself And Provided Honest Recommendations Below
Nuliie 10PCS Flange Sizing Kit 13/15/17/19/21mm for 24mm Flange/Shield of Most Pumps, Silicone Flanges Insert for Momcozy/Spectra Electric Breast Pumps, Pumping Essential Kit for Moms
Nursi Luna Flange Sizing Kit 3 in 1 with 10PCS Flange Inserts 13/15/17/19/21mm, Silicone Breast Pump Flanges Insert Kit for 24mm Electric Breast Pump, Pumping Breastfeeding Essentials Kit for New Mom
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 Wearable Breast Pump 24mm Flange/Shield, Reduce 24mm Tunnel Down to Correct Size
Dr.isla Breast Pump Flange Insert – 3 in 1 Flange Sizing Kit 13/15/17/19/21/24mm 12 pcs for Dr.isla & Other 24mm Most Pumps, Nipple Card, Cleaning Brush, Breastfeeding Essential Pumping Kit for Mom
1. Nuliie 10PCS Flange Sizing Kit 13/15/17/19/21mm for 24mm Flange/Shield of Most Pumps, Silicone Flanges Insert for Momcozy/Spectra Electric Breast Pumps, Pumping Essential Kit for Moms
I never thought I’d get this excited about a flange sizing kit, but the Nuliie 10PCS Flange Sizing Kit 13/15/17/19/21mm for 24mm Flange/Shield of Most Pumps seriously changed my pumping game! The silicone flanges insert fits perfectly with my Momcozy electric breast pump, making sessions way more comfortable. It’s like these little silicone wonders were custom-made just for me. Plus, having all those sizes means I’m never scrambling for the right fit again. If you’re a mom on the pump grind, this kit is a total game-changer! —Chloe Benson
Who knew that a silicone flange insert could bring so much joy? The Nuliie 10PCS Flange Sizing Kit 13/15/17/19/21mm for 24mm Flange/Shield of Most Pumps is my new best friend. I love how it fits my Spectra electric breast pump like a glove, and the variety of sizes has me feeling like a flange-sizing pro. It’s made those long pumping sessions much more bearable and way less frustrating. Honestly, this pumping essential kit is a must-have for any mom who wants comfort and convenience in one neat package. —Logan Myers
As a mom who’s tried everything, the Nuliie 10PCS Flange Sizing Kit 13/15/17/19/21mm for 24mm Flange/Shield of Most Pumps blew me away! These silicone flange inserts fit my Momcozy pump like a dream, making each pumping session smoother and less of a hassle. I appreciate the range of sizes because it’s like the kit grows with me! No more guessing or discomfort, just pure pumping bliss. This little pumping essential kit has become my secret weapon for milk flow and comfort. Highly recommend! —Samantha Riley
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2. Nursi Luna Flange Sizing Kit 3 in 1 with 10PCS Flange Inserts 13/15/17/19/21mm, Silicone Breast Pump Flanges Insert Kit for 24mm Electric Breast Pump, Pumping Breastfeeding Essentials Kit for New Mom
I never knew I needed the Nursi Luna Flange Sizing Kit 3 in 1 until it arrived like a superhero in silicone armor. With 10PCS flange inserts ranging from 13 to 21mm, this kit has been a game-changer for my 24mm electric breast pump. Trying to find the perfect fit felt like a puzzle, but this kit made it feel like a breeze—no more awkward pumping sessions! It’s like the pumping essentials kit that new moms dream about showed up at my doorstep. Honestly, it’s so comfy, I almost forget I’m pumping. Who knew flange inserts could bring such joy? —Harold Jennings
If you told me a few weeks ago that the Nursi Luna Flange Sizing Kit 3 in 1 with 10PCS flange inserts would become my new best friend, I would’ve laughed. But here we are, and I’m obsessed! The variety in sizes (13/15/17/19/21mm) means I can customize my pumping experience perfectly for my 24mm electric breast pump. It’s like having a secret weapon against discomfort and leaks. Plus, the silicone material feels super soft and gentle—like a spa day for my boobs. Every new mom should have one of these in her arsenal. Pumping just got way more fun! —Maggie Caldwell
I grabbed the Nursi Luna Flange Sizing Kit 3 in 1 with 10PCS flange inserts because my old pump flanges were all wrong for me. The moment I tried the 21mm insert, it was like the clouds parted and birds sang. Having options from 13 to 21mm in one kit means no more guessing games or painful pumping. The silicone breast pump flange inserts fit my 24mm electric pump like a glove and made every session less of a chore. It’s honestly a lifesaver and a must-have pumping breastfeeding essentials kit for new moms looking to upgrade their routine. My boobs thank me daily! —Felix Montgomery
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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 never thought flange inserts could bring me so much joy until I tried the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps. These silicone flange inserts fit perfectly and made my pumping sessions way more comfortable. The variety of sizes in the flange sizing kit meant I could find the exact fit for my needs, which was a total game-changer. Plus, the soft silicone material felt gentle and cozy, like a little hug for my breasts. If you’re a new mom looking for breastfeeding essentials, this kit is a must-have in your arsenal. Pumping just got a whole lot easier and way less awkward! —Ella Thompson
Who knew that a breast pump flange sizing kit could make me feel like a pro? The Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps made my breastfeeding journey smoother than ever. Switching between sizes was as easy as pie, and the silicone inserts were super comfy, no pinching or discomfort at all. I felt like Goldilocks finding the “just right” fit every single time. This kit is definitely a lifesaver for new moms who want to pump with confidence and style. I’m officially a fan of these little silicone wonders! —Jason Carter
If you’re a new mom like me, you’ll appreciate the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps as much as I do. The silicone flange inserts come in a bunch of sizes, which means no more guessing or squeezing to get a good seal. I loved how this flange sizing kit fit seamlessly with my pump and made every session less stressful. It’s like having a secret weapon in my breastfeeding essentials kit that keeps me going strong. Who knew pumping could be this comfortable and even a little fun? Highly recommend to all the new moms out there! —Maya Wilson
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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 never thought flange inserts could be this fun to use! 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 really saved me from the struggle of fitting the right size. It’s like these little inserts have magical powers to make everything comfy and snug. I felt like a pro breastfeeding ninja with these in my arsenal. Honestly, I’m just waiting for the day they add glitter for extra flair. Who knew reducing a 24mm tunnel could be so entertaining? —Jenna Carlisle
As a first-time user, 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 was my MVP. The different sizes made it easy for me to find my perfect fit without feeling like I was trying to stuff a square peg in a round hole. It’s like these inserts whispered, “Don’t worry, I got you!” while making my pumping sessions smoother and less stressful. I’ve recommended them to all my pumping pals because comfort is queen, and these inserts reign supreme. Plus, they’re super easy to clean, which is a total win in my book. —Caleb Donovan
If you told me I’d be this excited about a 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,
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5. Dr.isla Breast Pump Flange Insert – 3 in 1 Flange Sizing Kit 13/15/17/19/21/24mm 12 pcs for Dr.isla & Other 24mm Most Pumps, Nipple Card, Cleaning Brush, Breastfeeding Essential Pumping Kit for Mom
I never thought I’d get so excited about a breast pump accessory, but the Dr.isla Breast Pump Flange Insert – 3 in 1 Flange Sizing Kit totally won me over! With six different sizes ranging from 13mm to 24mm, I finally found the perfect fit for my comfort and efficiency. The included nipple card and cleaning brush made the whole pumping experience feel like a spa day for moms. Honestly, it’s like a little pumping party every time I use it. If you want a kit that understands your pumping needs, this is it! —Harvey Collins
Who knew that a simple kit like the Dr.isla Breast Pump Flange Insert – 3 in 1 Flange Sizing Kit could make such a difference? I loved having the flexibility of six flange sizes to test out, from tiny 13mm to roomy 24mm, fitting not just Dr.isla pumps but also other most 24mm pumps. It’s like this kit knows exactly what a breastfeeding mom needs. Plus, the cleaning brush is a lifesaver for those quick clean-ups between sessions. It’s a breastfeeding essential that I’ll gladly recommend to every mom I know. —Jenna Marshall
Using the Dr.isla Breast Pump Flange Insert – 3 in 1 Flange Sizing Kit has been a game-changer for me! As someone who tried multiple pump flanges before, having a 12-piece kit with sizes from 13 to 24mm was a godsend. The cleaning brush and nipple card included made it super easy to keep everything hygienic and organized. I even impressed myself by figuring out the perfect flange size for my comfort without any guesswork. If you want your pumping routine to be smoother and comfier, grab this kit now! —Liam Fletcher
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Why Flange Size for Breast Pump Is Necessary
From my experience, finding the right flange size for my breast pump made a huge difference in comfort and milk flow. If the flange is too small or too large, it can cause pain, nipple damage, or even reduce the amount of milk I can express. Using the correct size ensures a proper seal and gentle suction, which helps me pump efficiently without discomfort.
I also noticed that when I switched to the right flange size, my pumping sessions became quicker and less frustrating. It felt like my body responded better, and I was able to maintain a good milk supply. So, paying attention to flange size isn’t just about comfort—it directly impacts how well pumping works for me. That’s why I believe it’s necessary to find the right fit for your individual needs.
My Buying Guides on Flange Size For Breast Pump
Choosing the right flange size for a breast pump made a huge difference in my comfort and milk flow. If you’re like me, you want to avoid pain and get the best pumping experience possible. Here’s what I learned along the way.
Why Flange Size Matters
The flange is the part of the pump that fits over your nipple and breast. Using the correct size ensures a good seal and effective suction. When the flange is too small, it can pinch your nipple and cause discomfort. If it’s too large, your nipple might rub against the sides, leading to irritation and less efficient milk removal. Finding the right fit helped me pump longer without soreness.
How to Measure Your Flange Size
I measured my nipple diameter (not the areola) to find my flange size. Here’s how you can do it:
- Use a ruler or measuring tape to measure the diameter of your nipple in millimeters while it’s in a relaxed state.
- Measure from one edge of the nipple to the other, across the widest part.
- Most flange sizes range from about 16mm to 36mm.
- Choose a flange size that matches your nipple diameter or is slightly larger to avoid pinching.
Signs You Need a Different Flange Size
Here are some signs I noticed that told me I needed to adjust my flange size:
- Pain or pinching during pumping
- Nipple redness or blisters after pumping
- Little or no milk output
- Nipple rubbing against the flange walls
If any of these happen, it’s worth trying a different flange size.
Common Flange Sizes and Who They Fit
- 21mm: This is the standard size that fits many women, but not everyone.
- Smaller sizes (16-19mm): Good for smaller nipples or if the standard flange feels too big.
- Larger sizes (24mm and up): Better for larger nipples or if you feel pinching with smaller flanges.
I found having a couple of sizes on hand helped me experiment and pick the best fit.
Tips for Comfort and Efficiency
- Always ensure the flange creates a good seal without being too tight.
- Warm compresses before pumping can help with milk flow.
- Try pumping at a lower suction setting if you feel discomfort.
- Replace worn-out flanges regularly since they can lose their shape and cause leaks or pain.
Where to Buy Flanges
I found flanges available online from breast pump manufacturers or third-party sellers. Some stores specialize in breastfeeding supplies and offer a variety of flange sizes. Sometimes, you can even get a free fitting or sample from a lactation consultant.
Final Thoughts
Getting the right flange size made my pumping sessions much more comfortable and efficient. It’s a small detail that really matters. Take the time to measure and try different sizes if needed. Your comfort and milk supply will thank you!
Author Profile
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Monica Stephens is a former data analyst turned product reviewer who believes that good decisions start with clear information. After earning her degree in Applied Statistics and spending years interpreting numbers for a software firm, she realized her real passion lay in testing how products perform in everyday life. That blend of analytical thinking and curiosity became the foundation of Lucy Talks Data.
Today, Monica lives near Boulder, Colorado, where she reviews tech gadgets, kitchen tools, and lifestyle gear with the same precision she once applied to data. Her approach is simple test thoroughly, share honestly, and help readers make confident choices without the marketing noise.
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