Completely Free · No Telehealth Needed
Free Nipple
Sizing.
The wrong flange is the #1 cause of pumping pain and low milk output — and most mamas are using the wrong size. Carisa, IBCLC, offers free nipple sizing to help find your best flange fit — no cost to you.
No telehealth appointment required
Response from Carisa personally
Works for any breast pump brand
Recommendations are based on nipple measurements and general fit guidance. Individual results can vary depending on breast anatomy, tissue elasticity, nipple shape, and other personal factors — a recommendation is a starting point for trialing, not a guarantee.
📏
Free Nipple Sizing
by Carisa Myers, IBCLC
15mm
17mm
19mm
21mm
24mm
27mm
30mm
Most mamas
Wrong Size
before getting help
Result after fitting
Less Pain
+ more milk output
24mm
Most common starting size
But your correct size may be very different —
that's exactly why we measure.
Why It Matters
The right flange changes everything.
Your breast pump flange — the funnel-shaped shield that fits over your nipple — creates the seal that allows your pump to express milk. If that fit is off, even slightly, it affects everything: comfort, milk output, and long-term breast health.
Most pumps come with a standard 24mm flange, but nipple diameters vary widely from person to person. Using a flange that's too small causes painful friction. Using one that's too large pulls in areola tissue and reduces suction efficiency. Neither is acceptable when there's a better option.
Signs You May Be Wrong-Sized
Nipple pain or soreness during pumping
Nipple rubbing the sides of the tunnel
Redness or discoloration after sessions
Excessive areola being pulled in
Breasts still feeling full after pumping
Decreased milk output over time
The Process
How Free Nipple Sizing Works
Carisa offers free nipple sizing to help find your best flange fit — no guesswork, no generic charts.
1
📐
Measure
Measure your nipple diameter at its base before pumping using a ruler or nipple measuring tool.
2
📝
Submit the Form
Fill out the Google Form below with your measurements and any pumping concerns you're experiencing.
3
👩⚕️
Carisa Reviews
Carisa personally reviews every submission.
4
📬
You Hear Back
You'll receive a personalized size recommendation by email — with notes on what to trial and why, plus what to check for once you try it.
Confirming Fit
How you'll know it's the right fit
A size recommendation is a starting point — trialing it is how you confirm it's right. Once you try your recommended flange, check for these four signs.
💗
Feel
Feels like nothing, or a gentle tug — never pain or pinching.
📏
Intensity
Only the nipple enters the tunnel; sides gently touch the walls without dragging.
⏱️
Tempo
Nipple moves slightly with the pump cycle, without rubbing or friction.
🥛
Supply
Milk sprays during the session rather than only dripping.
Know Your Options
Types of flanges
Different flanges work for different bodies and pumps. Carisa's recommendation will include guidance on the right type for you.
🔵
Standard Plastic
Come with most pump kits. Rigid, easy to clean, widely available in many sizes.
Most Common
🤍
Silicone
Softer and more flexible. Ideal for sensitive skin and those who find rigid flanges uncomfortable.
Sensitive Skin
🎯
Insert / Reducer
Placed inside an existing flange to reduce the tunnel diameter — great for achieving smaller sizes.
Size Down
📐
Angled
Tilted design reduces strain on your back and shoulders. Great for frequent pumpers and those who pump hands-free.
Ergonomic
After You Submit
What happens next
Here's exactly what to expect after submitting your flange sizing request.
01
👀
Carisa reviews your submission
Every form is personally reviewed by Carisa using your measurements, pumping history, and any symptoms you noted. No bots. No templates. Real eyes on your information.
02
📧
You receive an email recommendation
Carisa will email you with your recommended flange size(s) — including notes on which type of flange to look for and where to find it for your specific pump brand.
03
🍼
Try it and follow up
Try the recommended size and let us know how it goes. If you need further support or want a full telehealth consultation, Carisa is available for a booked session.
Questions
Flange sizing FAQ
Common questions about the free sizing service and flange fit in general.
Is this really free? What's the catch?+
Yes — completely free, no strings attached. Carisa offers free flange sizing because she believes every pumping mama deserves access to basic guidance without a financial barrier. There is no upsell required and no obligation to book a paid consultation.
How do I measure my nipple correctly?+
Measure the diameter of your nipple at its base — not the areola — before pumping. Use a millimeter ruler or a nipple measuring tool. The nipple is the protruding part only; do not include surrounding areola tissue in your measurement. Take the measurement from the widest point.
Do I need to add millimeters to my nipple measurement?+
Prior to adapting the Flange FITS protocol, The Milk Effect was using the add 0–2mm methodology, which may not work for some individuals. Every mama's fit is different, which is why measurements are reviewed individually rather than applying a flat rule to everyone.
My nipples are different sizes on each side — is that normal?+
Completely normal. It's very common to have a slight difference in nipple diameter between sides. Measure both and note them separately in the form. You may end up using two different flange sizes — one for each side — which is perfectly fine and actually very common among pumping mamas.
Can my flange size change over time?+
Yes. Nipple size and shape can change postpartum, during different stages of your milk journey, and even as your supply changes. If you notice pumping becoming uncomfortable again after a period of good sessions, it may be worth re-measuring and submitting a new request.
Does flange sizing work for wearable pumps too?+
Yes — flange sizing is relevant for all breast pump types, including wearable pumps. Note your pump brand and model in the form so Carisa can factor in the size ranges available for that specific pump, as sizes vary by length as well.
What if I need more support after receiving my size?+
If you'd like a deeper dive — covering pump settings, schedules, milk supply, or other concerns — Carisa currently is transitioning to another state so she will refer you to a trusted IBCLC who specializes in pumping.
A note on our approach: nipple sizing recommendations are informed by the Flange FITS™ Guide, developed by Jeanette Mesite Frem, MHS, IBCLC, RLC, CCE of Babies in Common, and by current peer-reviewed research: Anders, L. A., Frem, J. M., & McCoy, T. P. (2025). Flange size matters: A comparative pilot study of the Flange FITS™ Guide versus traditional sizing methods.
Journal of Human Lactation.
Read the study. The complete Flange FITS™ Guide, available in multiple languages, can be downloaded directly from
Babies in Common.
★★★★★
"Things are going so well with my new flange sizes — a slight increase in milk and absolutely no pain while I pump. Life-changing!"
— Anisah, follow-up client
✅ No pain · More milk
★★★★★
"Carisa was very knowledgeable, thorough, and helpful. I highly recommend her services to any mama who needs real support."
— Brittany, verified client
💪 Immediate improvement
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