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Flange Sizing: What Most Pumps Get Wrong

One of the most important measurements that determines whether you pump comfortably is the flange tunnel length.

If it's too short, your nipple is likely to crash into the back of the pump and cause pain while pumping, which can lead to many issues including lessened milk output.

Meet Willow Go

Designed for more comfort & milk output

It's our best seller for a reason. Powered by innovative ComfortFlow™ technology, Willow Go is designed to fit your anatomy, giving you more comfort, convenience, and milk output.

Expert Tips & Advice

Join more than 5,000 moms in the Willow Community to find answers to common breastfeeding questions, learn from Willow experts, and connect on all things postpartum.

Inventor of the first wearable breast pump in 2017

US-based, clinically tested, and FDA approved.

120+ patents and 5 trademarks

World-class smart technology

We believe moms deserve better

Since creating the first fully wearable pump, we've continued to innovate in ways that always put moms first - helping them extend their breastfeeding journey with more freedom and less compromise.