You can download the Printable nipple ruler here!
If you’re pumping and things feel… off — it could be your flange size.
A poor fit is one of the most common reasons for pain, swelling, or low milk output when using a breast pump. That’s where our printable nipple ruler comes in. It helps you measure your nipple (not your whole boob!) so you can pick the right size flange — something most pumps don’t tell you.
Why flange fit matters
Using the wrong size can lead to:
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Pinching, rubbing, or soreness
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Poor milk removal
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Nipple trauma or blocked ducts
The right size? Total game changer. More comfort, better output, less drama.
Designed for Breastie 1.0
Our flange sizes include 13mm, 16mm, 19mm, 21mm, and 24mm — all compatible with the Breastie 1.0. If you’re in between sizes, start small — it’s easier to size up than down.
We made this nipple ruler so you can stop guessing. And if you’re unsure, we’re just an email away: hello@breastfriend.co.nz.
