New Sizing Inserts
New Sizing Inserts
New Sizing Inserts
New Sizing Inserts

Sizing Inserts

2-Pack

Designed for the perfect fit and performance with Willow, Sizing Inserts make pumping more comfortable for mamas with smaller flange sizes.

  • Improves fit and comfort for moms who need a flange size smaller than 21mm
  • Flexible silicone material for snug, secure fit
  • Fits into 24mm Willow Pump Flanges and Containers only
  • Dishwasher safe
  • BPA free
  • Download the Instructions for Use

Insert Size

Size Guide

  • 15mm
    Coming Soon
  • 17mm
  • 19mm

$17.99

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What's Your Willow Size?

For most moms, adding 2-4mm to your nipple size results in the most comfortable fit. All bodies are different - nipple and flange sizing is more of an art than a science! Our team is here to help if you need it.

Need help measuring?

If Your Nipple Measurement Is:
Then Your Willow Size Is:
23-25mm
27mm
20-22mm
24mm
17-19mm
21mm
15-17mm
19mm Sizing Insert in 24mm Flange*
13-15mm
17mm Sizing Insert in 24mm Flange*
11-13mm
15mm Sizing Insert in 24mm Flange*

*Sizing Inserts fit 24mm Flanges and Containers only. Sizing Inserts, Containers and Flanges sold separately.

Questions? Our experts can help.
1-888-WILLOW-3