The verdict
This flange sizing kit helps parents find their correct breast pump flange size with an easy-to-use sizing tool, leading to improved milk output and comfort during pumping sessions.
What parents love
- • easy sizing tool and instructions
- • dramatically improves milk output
- • works with multiple pump brands
- • soft and durable material
- • great value for multiple sizes
Worth knowing
- • cardboard sizing tool could be sturdier
Specs
| Material | Silicone |
| Reusable | yes |
| Compatible With | Willow Go, Willow Wave, Willow 360, and most 24mm flanges |
| Includes Sizing Tool | yes |
| Sizing Inserts Included | 5 sets (13mm, 15mm, 17mm, 19mm, 21mm) |
How we read it: distilled from 46 Amazon reviews, last checked July 24, 2026. We carry no affiliate links and no brand pays to be featured — here's how we work.
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