PersonalFit breast shields | Breast shields | Medela - Medela 40mm breast shield
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24mm. 27mm. 24mm. SoftFit TM. 30mm. 21mm. 21mm. 24mm. 40mm. PersonalFit TM. Connector Ensuring correct breastshield size will make pumping more. Breast shields play a key role in pumping comfort and efficiency. Having an incorrect size breast shield can hinder milk supply and possibly cause nipple trauma.