Rated 4.1 out of 5
Based on 163 reviews

Willow® Sizing Insert Set
(2-pack)

$19.99

Our breast pump sizing inserts are designed to help optimize comfort and output for moms who measure smaller than 21mm.


Available in sizes 13mm, 15mm, 17mm, 19mm and 21mm for use with 24mm Willow flanges and containers.


Did you know: you should replace pump parts every three months for optimal performance. Normal wear and tear can impact suction and output! Having extras on hand is helpful in the event that you lose a part, too.


Select a size
What's my size?
  • 13mm
  • 15mm
  • 17mm
  • 19mm
  • 21mm
Free shipping on orders over $70

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  • FSA/HSA reimbursements eligible

average rating 4.1 out of 5
Based on 163 reviews
  • 5 Stars
    107 Reviews
  • 4 Stars
    15 Reviews
  • 3 Stars
    12 Reviews
  • 2 Stars
    11 Reviews
  • 1 Star
    18 Reviews
76% of reviewers would recommend this product to a friend
Customer photos and videos
163 Reviews
Reviewed by Rex S.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

10/10 buy the inserts if you have smaller nipples

These inserts make a world of difference I wasn't even pumping 2 whole oz and with these inserts I'm getting 3 oz each pump willow is amazing I was thinking earlier it would be really nice if yall would make some adjustable straps and make the somehow connect to the pump so the pumps their selves can be worn like a bra I hate having to put them in my bra only when I'm power pumping because the pumps shift a bit when I am turning the pumps off and on for the start and wait time but straps to be able to wear the pumps like a bra would be amazing

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Reviewed by Sylvia W.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Prefect solution for smaller nipples

The sizing inserts are sleek, soft and comfortable for women with smaller nipples. It’s definitely a game changer.

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Reviewed by Elana F.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

not painful!

finally an insert i like!

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Reviewed by Meredith P.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Fit well

These inserts are very comfortable and make for a secure fit.

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Reviewed by Ashley W.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Size 21 works great!

The inserts definitely helped. I did notice I fluctuate throughout the day with keeping track of when I use them and when I don’t so definitely will be needing to order another pair when I order my Willow go.

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