Rated 4.0 out of 5
Based on 183 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

2 ways to pays with

Insurance & HSA/FSA

  • FSA/HSA reimbursements eligible

average rating 4.0 out of 5
Based on 183 reviews
  • 5 Stars
    114 Reviews
  • 4 Stars
    18 Reviews
  • 3 Stars
    16 Reviews
  • 2 Stars
    12 Reviews
  • 1 Star
    23 Reviews
73% of reviewers would recommend this product to a friend
Customer photos and videos
183 Reviews
Reviewed by Giselle G.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Best friend

I’m 16mm before and after pumping and finishing the correct flange size for comfort is hard. Having the inserts makes a huge difference in comfort and being able to stay on the pump longer. Definitely recommend!!

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Reviewed by Chelsie R.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Perfect

The inserts are perfect for sizing the flanges. Easy to insert, easy to take out and clean. Soft silicone for comfort.

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Reviewed by Sara M.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

As expected

They fit in snug, can't feel them, easy to clean.

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Reviewed by Rosalina V.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

cute

Cute and comfy

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Reviewed by Melissa C.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Great

Love these inserts, easy to clean, confortable

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