Breast Pump Sizing Kit
$
24.99
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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Q&A
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Will these work with other breast pumps?
Best Answer: Yes. The Willow Breast Pump Sizing Kit is designed to work with more than just Willow pumps. The included silicone inserts are compatible with most 24 mm breast pump flanges, so you can use them with many other breast pump brands that have 24 mm flanges.
Keep in mind that the inserts are specifically made to fit 24 mm flanges. They are not universal for other flange sizes (such as 21 mm, 27 mm, or 28 mm), so compatibility depends on your pump's flange size.
Customer reviews
41 Ratings
1-10 of 41 Reviews
Great addition to make pumping
This review was collected as part of a promotion
Great addition to make pumping unique to anyone. Didn’t think I needed custom sizing until I tried and was pleasantly surprised by the better fit.
Jun 22, 2026
I love that it comes
This review was collected as part of a promotion
I love that it comes with a lot of sizes!
Jun 16, 2026
This was so nice to
This review was collected as part of a promotion
This was so nice to have to help during the pumping journey.
Jun 12, 2026
I love that I can
This review was collected as part of a promotion
I love that I can get all sizes. Specially since each breast needs a different flange size. It is more cost effective to buy the sizing kit if you need two sets that are different sizes.
Jun 4, 2026
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
