Size does matter....but bigger is not always better
Amazon.com : Spectra - Breast Flange Replacement for Breast Milk Pump - Small 20mm : Baby
Free Breast Pump Flange Size Guide - Mohawk Valley Lactation
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Breast pump flange size guide | PDF
Breast Shield Sizing Guide: How to Get the Right Fit – Cimilre Breast Pumps
Amazon.com : TSRETE Flange Compatible with S9/S10/S12 Parts Replaces, Hands Free Breast Pump Shield/Flange, Breast Pump Parts Replace(27mm) - 1 Pc : Baby
Helpful Breast Shield Sizing Guide | Medela
Helpful Breast Shield Sizing Guide | Medela
How to Choose the Right Size Breast Flange - Acelleron Medical Products