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Breastshield - how to get the right size breastshield for your Medela Pump
Medela Breast Shield Sizes - How to know if the size is right for you. - YouTube
Amazon.com : Swing Tubing and Breast Pump Kit Compatible with Medela Swing Breastpump. Inc. 1 Medium Breastshield (Comparable to Medela Personalfit 24mm), 1 Valve, 1 Membrane, and 1 Replacement Tubing : Breast Feeding Supplies : Baby