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Determine the diameter of your nippleThe standard breast shield that comes with the Mon Lait Pump is 24mm, however, you may need a smaller or larger flange based on your measurement.
Nipple to Breast Shield Size Guide:
Nipple size up to 15mm - 17mm Flange Inserts
Nipple size up to 17mm - 21mm Flange Inserts
Nipple size up to 20mm - 24mm Breast Shield(Comes with the Pump)
Nipple size up to 25mm - 27mm Breast Shield
If you purchased extra breast shields and they do not fit you perfectly, we will send you the right size free of charge. Proof of purchase is required.