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
$14.99
In Stock
Eligible for registries and wish lists
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Guests are saying
The product has received positive feedback for its effectiveness in helping guests find the right flange size for their breast pumps. Many guests appreciate the variety of sizes included, which allows for a personalized fit, enhancing comfort and milk output. The included sizing chart and measuring tool are praised for their clarity and ease of use. Overall, this kit is seen as an essential tool for both new and experienced breastfeeding mothers, making the pumping journey smoother and more efficient.
Summary created by AI from text of reviews reflecting recent feedback provided across different star ratings (includes incentivized reviews)
4.8 out of 5 stars with 117 reviews
100% would recommend
3 recommendations
5 out of 5 stars
Thumbs up graphic, would recommend
25 October, 2026Verified purchase
Perfect fix for ill-fitting flanges
Worked great with my Spectra! Perfect inserts.
5 out of 5 stars
24 October, 2026
originally posted on onewillow.com
These helped me get more
[This review was collected as part of a promotion.] These helped me get more milk. Love willow
5 out of 5 stars
Thumbs up graphic, would recommend
24 October, 2026Verified purchase
(no review title)
Helpful when you need to figure out what works for you at the beginning of your breast feeding journey
5 out of 5 stars
18 October, 2026
originally posted on elvie.com
so helpful!
[This review was collected as part of a promotion.] really helpful both to measure and then try the different inserts in my breast pump flanges
4 out of 5 stars
25 September, 2026
originally posted on onewillow.com
The sizing chart is super
[This review was collected as part of a promotion.] The sizing chart is super helpful and the flanges fit great. I just wish there was a way to order the size I need and not the entire sizing kit.
4 out of 5 stars
25 September, 2026
originally posted on onewillow.com
The sizing chart is super
[This review was collected as part of a promotion.] The sizing chart is super helpful and the flanges fit great. I just wish there was a way to order the size I need and not the entire sizing kit.
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
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
5 out of 5 stars
5 September, 2026
originally posted on onewillow.com
So helpful to figure out
[This review was collected as part of a promotion.] So helpful to figure out the right size I needed!
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.
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.
5 out of 5 stars
12 August, 2026
originally posted on onewillow.com
Super helpful. Thank you!
[This review was collected as part of a promotion.] Super helpful. Thank you!
5 out of 5 stars
9 August, 2026
originally posted on onewillow.com
Easy to use, great value
[This review was collected as part of a promotion.] Easy to use, great value for the price!
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????
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
23 June, 2026
originally posted on onewillow.com
I’m not quite sure why
[This review was collected as part of a promotion.] I’m not quite sure why 1 set is $15 and for an entire kit it’s only $5 more.
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
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.