02/02/2026
Breast size has nothing to do with pump fl**ge size.
None. Zero. Not even a little.
Somehow some still think that cup size determines fl**ge size, and it’s caused so much unnecessary pain, low output, and self-doubt. Your breasts can be large, small, uneven, full, soft. None of that tells us what fl**ge you need.
What Actually Determines Fl**ge Size
Pump fl**ge fit is about the ni**le, not the breast.
Specifically:
•The diameter of the base of the ni**le
•The diameter of the ni**le tip
•How the ni**le moves dynamically during pumping
This is the foundation of the FITS protocol developed by Jeanette Frem: a more accurate, more humane way of fitting pumping parents.
Instead of guessing based on breast size or handing out one or two standard fl**ges, FITS looks at how your ni**le behaves under suction, not just how it looks at rest.
The goal of a fl**ge is not just “milk comes out.”
It matters:
•How the pump feels on your body
•Whether pumping causes pain, blanching, or swelling
•How efficiently milk is being moved
•Whether pumping feels sustainable long-term
A good fit supports milk flow without trauma.
What Proper Fl**ge Fit Looks Like
•Only the ni**le should be moving in the tunnel
•Minimal to no ar**la should be pulled in
•The ni**le should move freely, not rub, swell excessively, or turn white
•Pumping should feel effective and tolerable
When too much ar**la is being pulled into the tunnel, it can:
•Restrict milk flow
•Cause swelling that makes output worse over time
•Increase pain and inflammation
•Lead parents to believe they have “low supply” when the issue is mechanical
Fl**ge sizing is not about how big your breasts are.
It’s about how your ni**le interacts with the pump.
Comfort matters. Efficiency matters. Long-term tissue health matters.
And if pumping feels awful or unproductive, that’s not a personal failure. iIt’s a signal that something may need adjusting.
You deserve pumping equipment that works with your body, not against it 💛