How to measure the diameter of your nipple?
1. The standard flange size is often 24mm but you may need a smaller/larger flange/shield based on your measurement.
2. Compare the diameter of your nipple to the size guide chart.
Spectra 24mm (15-21mm Flange Insert) and 27mm ( 24mm Flange Insert).
Spectra Handsfree Cups.
MomMed Electric Breast Pump.