willow
breast-pumps| Size | Base of Nipple Measurement |
|---|---|
| 21mm | 17-19 mm |
| 24mm | 20-22 mm |
| 27mm | 23-25 mm |
All Sizes in Inches Unless Otherwise Stated
WILLOW Breast Pump Sizing Kit - 12pc
$18.79 was $24.99
New lower price save $6.20 (25% reduction)
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Guests are saying
The flange sizing kit is a game changer for breastfeeding and pumping moms, offering a variety of comfortable inserts and a sizing tool to ensure the perfect fit. Guests appreciate the ease of use, clear instructions, and the ability to find the right size without the hassle of trial and error. This kit not only enhances comfort but also improves milk output, making it an essential addition to any pumping journey.
Summary created by AI from text of reviews reflecting recent feedback provided across different star ratings (includes incentivized reviews)
4.9 out of 5 stars with 88 reviews
100% would recommend
1 recommendations
5 out of 5 stars
8 September, 2026
originally posted on onewillow.com
Easy to use- love that
[This review was collected as part of a promotion.] Easy to use- love that you get to try all of the sizes
3 out of 5 stars
25 August, 2026
originally posted on onewillow.com
Works great with my spectra
[This review was collected as part of a promotion.] Works great with my spectra and is super easy clean. The beast bump sizing kit starts with too small of a size. Only one size works for me.
5 out of 5 stars
16 August, 2026Verified purchase
(no review title)
They are thinner on the edges than other flange inserts I have tried which makes them more comfortable. For me pumping spray and using my true nipple size (i.e., NOT sizing up as recommended) works best for me.
5 out of 5 stars
16 August, 2026Verified purchase
(no review title)
Loved that it came with the flange inserts so I could use them with my spectra pump made my feeding journey so much easier.
1 out of 5 stars
12 July, 2026
originally posted on onewillow.com
Confusing. I’m a size 18mm
[This review was collected as part of a promotion.] Confusing. I’m a size 18mm regular flange but I’m suppose to use a 24 with the Willow according to the directions????
5 out of 5 stars
22 June, 2026
originally posted on onewillow.com
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.
5 out of 5 stars
Thumbs up graphic, would recommend
21 June, 2026
A must if you are pumping
Really loved this product instantly helped with me pumping pain. They work great in electric pumps. in manual pumps as well but they fall into the insert because the fanned out design, but honestly they still work and help. I was so grateful that these were in store and didn’t have to wait to get some shipped.
5 out of 5 stars
12 June, 2026
originally posted on onewillow.com
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.
5 out of 5 stars
4 June, 2026
originally posted on onewillow.com
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.
5 out of 5 stars
29 May, 2026
originally posted on onewillow.com
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!
5 out of 5 stars
28 May, 2026
originally posted on onewillow.com
Highly recommended! Easy to use
[This review was collected as part of a promotion.] Highly recommended! Easy to use and follow. Super comfy!
5 out of 5 stars
22 May, 2026
originally posted on onewillow.com
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!
5 out of 5 stars
5 May, 2026
originally posted on onewillow.com
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!
5 out of 5 stars
29 April, 2026
originally posted on onewillow.com
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!
5 out of 5 stars
26 April, 2026
originally posted on onewillow.com
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.
5 out of 5 stars
28 March, 2026
originally posted on onewillow.com
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!
5 out of 5 stars
28 March, 2026
originally posted on elvie.com
Takes the guesswork out of
Takes the guesswork out of what size I needed. Comes with a size guide!
5 out of 5 stars
14 March, 2026
originally posted on onewillow.com
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.
5 out of 5 stars
14 March, 2026
originally posted on elvie.com
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.
5 out of 5 stars
3 March, 2026
originally posted on onewillow.com
Sizing Kit Review
The sizing inserts are perfect for getting the right flange size! They are super comfortable. The best part is having a variety of sizes to try. This helped find the perfect fit. I highly recommend this product!