4.0
Rated 4.0 out of 5 stars
258 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 $69

2 ways to pays with

Insurance & HSA/FSA

  • FSA/HSA reimbursements eligible

Total 5 star reviews: 160 Total 4 star reviews: 22 Total 3 star reviews: 23 Total 2 star reviews: 13 Total 1 star reviews: 40
4.0
Rated 4.0 out of 5 stars
Based on 258 reviews
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258 reviews
  • Cassie K.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    17 hours ago
    Inserts = Game Changer

    I love these inserts. I cannot feel the pump at all now and output is MUCH better.

  • Erika O.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    2 weeks ago
    Fit perfectly!

    The flanges made pumping easier and more efficient

  • Amanda S.
    Verified Buyer
    Rated 3 out of 5 stars
    2 weeks ago
    Willow sizing inserts

    They are fine. Hard to see through and I don’t love the scalloped edge.

  • Brianna B.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    3 weeks ago
    Itty Bitty Committee!

    Found out with my last little that I was pumping with the wrong flange size. Was excited to be properly sized this time and it's lifechanging having the proper size! No pain at all. This also makes the hard plastic of the pump a bit more comfortable for me while pumping.

  • Aminnah E.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    4 weeks ago
    Super comfortable

    The sizing inserts feel great! Assuming you've got the right size, there's no pinching, tugging, or pulling when in use. To get used to the alignment I started with the inserts placed on myself making sure I'm perfectly centered and then I bring the pumps to the inserts before beginning. Once you get used to the feel you can just pump with the inserts already in the pump.

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