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The breast shell size is correct if...
If your nipple rubs uncomfortably on the inner side of the funnel, use a larger breast shell/ breast shell insert. If the areola is also sucked into the funnel, use a smaller breast shell.
A soft shield, like the Ardo Optiflow, is recommended for sensitive nipples and stimulation of the milk ejection reflex. It makes expressing more comfortable and stimulates milk flow.
Breast shells/inserts (31mm breast shells and 28mm inserts) for Ardo Calypso and Carum breast pump set. Sold as a pair (2) each, four total pieces.
Also available, additional breast shell/flange sizes: 15-17mm, 17-19mm, 22mm, 26mm, 28mm, 31mm, and 36mm.