How to choose the right size of breastshields for you?

Answer: The inner diameter of the breastshield (B) should be 1-2 mm larger than the diameter of your nipple (N) AFTER a pumping session or 3-5 mm BEFORE a pumping session.  You should be able to see free movement of your nipple during pumping and there should be little or no suction of the areola into the tunnel of the breastshield.

myfit chart

When it comes to pumping comfort, every millimeter counts.  That is why we design a series of breastshields of small increment sizes.  Maymom MyFitTM one-piece breastshields are available in 13, 15, 17, 19, 21, 23, 24, 25, 26, 27, 28, 29, 30, 34, and 36mm internal diameters plus 17, 19, 21, 22, and 24 mm inserts to fit the majority of breast pumping mothers.

How to measure the diameter your nipple?

Download the nipple caliper file, print it out, cut through the red line, fold along the green dots then you have made yourself a nipple diameter measuring tool!  See below for the finished ruler.

nipple rulermeasure nipple diameter
Medela, Freestyle, Pump in Style, Lactina, Symphony and Harmony are registered trademarks of Medela Holding AG, Switzerland. Maymom is not affiliated with Medela nor does Medela endorse the product.