Breast Pump Sizing Kit
$
23.99
Free shipping & returns for Babylist orders $45+
FSA & HSA Eligible
1
Overview
Description
Find your perfect breast pump flange fit with a wide range of inserts designed for maximum pumping comfort and milk output.
The kit includes 13mm, 15mm, 17mm, 19mm, 21mm insert sets, a nipple sizing tool, pump sizing 101 guide and 1:1 virtual visit with a Willow Sizing Specialist.
Proper fit leads to comfort, and comfort leads to more milk output and fit starts with your flange.
What we about it
Helps you find the just-right breast pump flange fit.
Details
- Includes:
- 13mm, 15mm, 17mm, 19mm, 21mm insert sets
- Nipple Sizing Tool
- Pump Sizing 101 Guide
- 1:1 virtual visit with a Willow Sizing Specialist
- Connect with a Sizing Specialist for personalized guidance
- Use with any pump; they’re compatible with almost all 24mm flanges
- Fit most nipple sizes
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Customer reviews
37 Ratings
1-10 of 37 Reviews
Great quality very soft and
This review was collected as part of a promotion
Great quality very soft and comfortable
Jun 2, 2026
So comfy and pretty!
I use the size 17 mm flange with my Spectra and have gotten better output! I do not have pain or ripped skin from suction. The edges of the flanges are like a flower and make it so much more comfy when removing the pumps, not to mention pretty!
May 28, 2026
super cute & durable!
This review was collected as part of a promotion
super cute & durable!
May 28, 2026
Highly recommended! Easy to use
This review was collected as part of a promotion
Highly recommended! Easy to use and follow. Super comfy!
May 28, 2026
Fits into my pump perfect
This review was collected as part of a promotion
Fits into my pump perfect and the sizing chart took the guessing out of finding the right size!
May 22, 2026
Helped me find my right
This review was collected as part of a promotion
Helped me find my right size which has made my output so much better!
May 5, 2026
Cute and useful!
I had no idea what the proper size flange is key for maximum output. My Spectra only had size 21 and 24 while the Willow kit put me on a size 17. After speaking with my lactation consultant, I learned the sizing kit was perfect for small girls like me!
Apr 29, 2026
These work wonderful, don’t slip
This review was collected as part of a promotion
These work wonderful, don’t slip and easy to clean.
Apr 26, 2026
Takes the guesswork out of
This review was collected as part of a promotion
Takes the guesswork out of what size I needed. Comes with a size guide!
Mar 28, 2026
Helpful convenient sizing kit
Very convenient to have one product that makes it easy to determine what size you are without having to buy and return multiple products until you find the correct fit.
Mar 14, 2026
