Home›Free Flange Sizing
Completely Free · No Telehealth Needed

Get Your Flange
Size Right.

The wrong flange is the #1 cause of pumping pain and low milk output — and most mamas are using the wrong size. Let Carisa, IBCLC, find your perfect fit at no cost to you.

No telehealth appointment required
Completely free — always
Response from Carisa personally
Works for any breast pump brand
📏 Submit My Measurements Why it matters →
📏
Flange 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
😣
Pumping Pain?Wrong flange size is the #1 cause
📉
Low Output?Poor fit reduces milk expression
🔬
Science-BasedSizing from peer-reviewed research
👩‍⚕️
IBCLC ExpertCarisa responds to every submission
✅
Correct fit = comfort
📈
Better output
🛡️
Protects breast tissue
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 flange sizing works

Carisa uses a measurement-based, evidence-informed approach to determine your optimal flange size — 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 using her IBCLC training and the latest flange sizing research.

4
📬
You Hear Back

You'll receive a personalized size recommendation by email — with notes on what to try and why.

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
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Silicone

Softer and more flexible. Ideal for sensitive skin and those who find rigid flanges uncomfortable.

Sensitive Skin
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Insert / Reducer

Placed inside an existing flange to reduce the tunnel diameter — great for achieving smaller sizes.

Size Down
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Angled

Tilted design reduces strain on your back and shoulders. Great for frequent pumpers and those who pump hands-free.

Ergonomic
Submit Your Info

Get your free
size recommendation

Fill out the form to the right with your measurements and details. Carisa reviews every submission personally and will email your recommendation directly.

📏
What you'll need
A millimeter ruler or nipple measuring tool (free download available in the store) to measure nipple diameter before pumping.
🤱
Measure before pumping
Nipple size can change during and after a session. Always measure before your first pump of the day for the most accurate result.
⚠️
Both sides may differ
It's completely normal for your left and right nipple to measure differently. Measure both and note them separately in the form.
⚡
Typical response time: 1–3 business days
Carisa responds to every submission personally by email.
📏
Free Flange Sizing Request
Submitted directly to Carisa Myers, IBCLC
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?+
Adding 0–2mm to your nipple diameter is a general guideline, but it isn't right for everyone. Some people pump more comfortably at their exact nipple diameter or even slightly below. That's exactly why getting a personalized recommendation from Carisa — rather than following a generic chart — makes a real difference.
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.
★★★★★

"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
Keep Learning

Also explore

📖
Why the Right Flange Matters

Read Carisa's full blog article on flange science — types, signs of poor fit, and how to choose correctly.

Read article → 🍼
Pumping Education Hub

Explore all pumping topics — from pump selection and scheduling to troubleshooting and accessories.

Go to education →
📐
Free Nipple Measuring Tool

A free printable nipple measuring ruler is coming soon to the shop — check back shortly.

Coming Soon