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Willow Breast Pump Sizing Insert - 2 of 3Willow Breast Pump Sizing Insert - 3 of 3
Willow Breast Pump Sizing Insert - 1 of 3

Willow Breast Pump Sizing Insert - 15mm: Compatible With Generation 3, Silicone, Breast Pump Accessories

4 Questions
$14.99 was $19.99
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Size15mm

In Stock

Free & easy returns
Free & easy returns
Return this item by mail or in store within 90 days for a full refund.
Eligible for registries and wish lists

At a glance

About this item

Highlights

  • Sizing Inserts make pumping more comfortable for mothers with smaller flange sizes
  • Improves fit and comfort for moms who need a flange size smaller than 21mm
  • Flexible silicone material for a snug, secure fit
  • Fits into 24mm Flanges (sold separately)
  • Nipple Measurements: 11-13mm nipple use Insert Size 15mm; 13-15mm nipple use Insert Size 17mm; 15-17mm nipple use Insert Size 19mm
  • Easy to assemble and clean, dishwasher safe
  • Not made with BPA

Description

Willow Go Flange is compatible with Willow Go Wearable Double Electric Breast Pump. Using the correct size breast pump flange makes pumping more comfortable and more efficient. Available in 3 sizes so you can find your best fit. In addition, 24mm flanges are compatible with sizing inserts for mamas who measure smaller than 21mm.
Dimensions (Overall): 6.81 Inches (H) x 2 Inches (W) x 4.45 Inches (D)
Weight: 20 Grams
Package Quantity: 2
Industry or Government Certifications: FDA Approved
Compatible With: Willow Generation 3 Breast Pumps
Material: Silicone
Care & Cleaning: Dishwasher-Safe
Warranty: 90 Day Limited Warranty. To obtain a copy of the manufacturer's or supplier's warranty for this item prior to purchasing the item, please call Target Guest Services at 1-800-591-3869
TCIN: 85236124
UPC: 858298006590
Item Number (DPCI): 030-05-4598
Origin: Imported
If the item details aren’t accurate or complete, we want to know about it.

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

Shipping details

Estimated ship dimensions: 5.5 inches length x 4.6 inches width x 1.6 inches height
Estimated ship weight: 0.0441 pounds

Return details

This item can be returned to any Target store or Target.com.
This item must be returned within 90 days of the date it was purchased in store, delivered to the guest, delivered by a Shipt shopper, or picked up by the guest.
See the return policy for complete information.

Q: Can these be used with the milk collector and manual pumps?

submitted by Ambz - 7 months ago
  • A: Our sizing inserts are compatible with Willow Wave™ and ideal to help improve comfort and fit, however they are not compatible with our Catch All Cups or Passive Manual Pump

    submitted byCustomer Care - 7 months ago
    Brand expert

Q: would this fit on my Elvie stride?

submitted by Jessica - 4 years ago
  • A: We have not tested our inserts on other pumps so cannot recommend.

    submitted byCustomer Care - 4 years ago
    Brand expert

Q: will the insert work with a 21mm flange?

submitted by Sb - 4 years ago
  • A: Willow inserts fit perfectly into our 24mm flanges and containers.

    submitted byCustomer Care - 4 years ago
    Brand expert

Q: is this just one flange or 2?

submitted by Bri122089 - 4 years ago
  • A: Inserts come in sets of 2.

    submitted byCustomer Care - 4 years ago
    Brand expert

Additional product information and recommendations

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4.3 out of 5 stars with 624 reviews
design: 4.8 out of 5
easy to clean: 5 out of 5
safety: 4.86 out of 5
87% would recommend
8 recommendations
5 out of 5 stars
23 July, 2026
originally posted on onewillow.com
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Super easy to clean and

[This review was collected as part of a promotion.] Super easy to clean and very comfortable while pumping. The inserts are soft enough that I don’t always have to use coconut oil before pumping.
Carla K.
Did you find this review helpful?
5 out of 5 stars
17 July, 2026
originally posted on onewillow.com
Image

I love my Willow Go!

[This review was collected as part of a promotion.] I love my Willow Go! The sizing inserts make it a perfect fit and give me the most milk output!
Samantha S.
Did you find this review helpful?
5 out of 5 stars
17 July, 2026
originally posted on onewillow.com
Image

Very comfortable sizing inserts! It’s

[This review was collected as part of a promotion.] Very comfortable sizing inserts! It’s just an added bonus that they’re cute!
Amy H.
Did you find this review helpful?
5 out of 5 stars
1 July, 2026
originally posted on onewillow.com
Image

This CHANGED my pumping experience.

[This review was collected as part of a promotion.] This CHANGED my pumping experience. I went from barely getting a drop to 3 ounces in one pump session
Michele W.
Did you find this review helpful?
5 out of 5 stars
28 June, 2026
originally posted on onewillow.com
Image

These have been super helpful

[This review was collected as part of a promotion.] These have been super helpful for my breast feeding journey. I’m already seeing an improvement in my supply vs my last journey. I genuinely believe it’s because I finally have the right fit
Latesa G.
Did you find this review helpful?
5 out of 5 stars
26 June, 2026
originally posted on onewillow.com
Image

These fit great in the

[This review was collected as part of a promotion.] These fit great in the 24mm flanges and they are also comfortable!
Morgan W.
Did you find this review helpful?
5 out of 5 stars
20 June, 2026
originally posted on onewillow.com
Image

These are so comfortable. I’ve

[This review was collected as part of a promotion.] These are so comfortable. I’ve bought two pairs! The silicone is so soft and I haven’t had any nipple irritation with using them.
CAYLEE K.
Did you find this review helpful?
5 out of 5 stars
17 June, 2026
originally posted on onewillow.com
Image

The Willow 360 is my

[This review was collected as part of a promotion.] The Willow 360 is my primary pump, although I mostly nurse my 2-month-old baby and only pump when I know I'll be away for a longer period or when I've been out for 3+ hours and need some relief, and while it took me a little time to learn how to use it effectively, I've found that the keys to success are having the correct flange size and wearing a supportive, well-fitting bra, which made a huge difference in both comfort and milk output.
AJ C.
Did you find this review helpful?
5 out of 5 stars
2 June, 2026
originally posted on onewillow.com
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I needed to start pumping

[This review was collected as part of a promotion.] I needed to start pumping early for my baby so she could bottle feed. These were much more comfortable than my regular pump so I preferred using the Willow with them over my main corded pump.
Meghan R.
Did you find this review helpful?
5 out of 5 stars
27 May, 2026
originally posted on onewillow.com
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Pumping output is so much

Pumping output is so much better with the right size
Rachael W.
Did you find this review helpful?
5 out of 5 stars
25 May, 2026
originally posted on onewillow.com
Image

Made all the difference in

[This review was collected as part of a promotion.] Made all the difference in the world! Make sure you’re changing your parts
Belinda J.
Did you find this review helpful?
5 out of 5 stars
16 May, 2026
originally posted on onewillow.com
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The Willow flange inserts were

[This review was collected as part of a promotion.] The Willow flange inserts were honestly one of my favorite parts of the pumping experience. They are incredibly comfortable and made a huge difference for me, especially having sensitive nipples. Compared to other flange inserts I’ve tried, these felt much softer and more natural while pumping and helped prevent the soreness I usually experience. They also created a much better fit, which made pumping more comfortable and efficient overall. I highly recommend the Willow flange inserts if you’re struggling with comfort or flange sizing. They made pumping feel significantly gentler, and more comfortable.
Erika B.
Did you find this review helpful?
5 out of 5 stars
26 April, 2026
originally posted on onewillow.com
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Very easy to use with

[This review was collected as part of a promotion.] Very easy to use with the Willow go & easy to clean :)
Maisey H.
Did you find this review helpful?
5 out of 5 stars
17 April, 2026
originally posted on onewillow.com
Image

These inserts are much more

[This review was collected as part of a promotion.] These inserts are much more comfortable than the standard silicone inserts I’ve used before. The quality of them are great and they fit snugly in the flanges of the Willow.
Ara K.
Did you find this review helpful?
5 out of 5 stars
15 April, 2026
originally posted on onewillow.com
Image

I really recommend getting these

[This review was collected as part of a promotion.] I really recommend getting these inserts. You can select your size and get multiples. It comes with 24mm and then 21mm inserts, which most of us girlies are not that size. Worth the money!
Meagan R.
Did you find this review helpful?
5 out of 5 stars
1 April, 2026
originally posted on onewillow.com
Image

Super comfortable and a great

[This review was collected as part of a promotion.] Super comfortable and a great fit! Highly recommend!
Catherine B.
Did you find this review helpful?
5 out of 5 stars
30 March, 2026
originally posted on onewillow.com
Image

The Willow Breast pump was

[This review was collected as part of a promotion.] The Willow Breast pump was the third hands-free wearable breast pump I tried, and I am so happy that I did! I love this pump and recommend it to family and friends all the time. Willow has made the breastfeeding journey of a busy on-the-go mom possible!
Jennifer D.
Did you find this review helpful?
5 out of 5 stars
19 March, 2026
originally posted on onewillow.com
Image

These feel so much softer

[This review was collected as part of a promotion.] These feel so much softer than other inserts I've tried. Love them
Jennifer S.
Did you find this review helpful?
1 out of 5 stars
19 March, 2026
originally posted on onewillow.com
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The willow is not working

[This review was collected as part of a promotion.] The willow is not working for me. I have only been able to get one ounce with a pumping session compared to 5 oz with the spectra. I tried a different flange size and this made no difference. I also tried different bras. Very disappointing especially for the price even with my insurance!
Celine S.
Did you find this review helpful?
5 out of 5 stars
18 March, 2026
originally posted on onewillow.com
Image

soft, comfortable and well-fitting. The

[This review was collected as part of a promotion.] soft, comfortable and well-fitting. The sizing guide was super helpful and accurate
Katie B.
Did you find this review helpful?

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