Breastfeeding Flange Size. The standard flange size differs between breastfeeding pump manufacturers. What i didn’t know is that if you are using a shield, the flange should be the same size!

The standard flange size is often 24mm, but you may need to select smaller or larger flanges based on your measurement. In my research, i found there to be a 1mm difference in standard flange sizing between the ameda and madela brands. Please consult your breastfeeding pump users manual for.