Sizing Inserts
HSA/FSA
Sizing Inserts
Sizing Inserts
Sizing Inserts
HSA/FSA
Sizing Inserts
Sizing Inserts
4.0
Rated 4.0 out of 5 stars
253 Reviews

Willow® Sizing Insert Set
(2-pack)

$19.99$15.99

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: 156 Total 4 star reviews: 22 Total 3 star reviews: 22 Total 2 star reviews: 13 Total 1 star reviews: 40
4.0
Rated 4.0 out of 5 stars
Based on 253 reviews
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253 reviews
  • Maria Anthonella Molina L.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    1 week ago
    Suaves

    Es una lástima que el.willow 3.0 no me saque nada de leche, pero estos adaptadores son muy suaves

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  • Kate R.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    1 week ago
    Works fine

    No issues

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  • Orin B.
    Verified Buyer
    I do not recommend this product
    Rated 1 out of 5 stars
    3 weeks ago
    Not helping

    I’ve tried multiple sizing inserts. No matter what u do , I never pump more than 1 oz total. With my wall pump I am getting 4 oz

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    WP Profile picture for Willow Pump
    Willow Pump
    3 weeks ago

    Hi, Orin! We greatly appreciate you providing this review and feedback of our Sizing Inserts! It can take several uses with a new size to see typical milk volume. This is common, so rest assured you are not doing anything wrong! More information about milk volume and tips to help can be found here: https://help.onewillow.com/s/article/Milk-volume-with-Willow-3-0.
    If you continue to experience any issues, please reach out to our Customer Care team at 1-888-WILLOW-3. We are here to help!

  • Maggie G.
    Verified Buyer
    I do not recommend this product
    Rated 1 out of 5 stars
    3 weeks ago
    Comfortable but useless

    These improve the comfort level but render the pumps nearly useless. I get less than 20ml when I use them as opposed to my usual 70-80ml without. Also makes latching more difficult.

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    WP Profile picture for Willow Pump
    Willow Pump
    3 weeks ago

    Hi, Maggie! If you are experiencing any issues with your pumps when using our Sizing Inserts, please give us a call at 1-888-WILLOW-3. It can take several uses with a new size to see our typical milk volume. This is common, so keep going and rest assured you are not doing anything wrong!

  • Christine K.
    Verified Buyer
    Rated 3 out of 5 stars
    3 weeks ago
    Necessary

    Easy to clean, necessary, but expensive

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