Features

• One-piece design; easy to clean, less piece to keep, and less chance for suction power loss.
• All components are safe for steam sterilization, microwave sterilized or sterilized in boiling water.
• Compatible with all Medela pumps except Sonata, FreeStyle, Swing Maxi and Harmony.
• US FDA registered medical device; Comply with US FDA standards for containers that contact food and class II medical device.
• Standard sized 25 mm inner diameter is most comfortable for the majority of breast feeding moms. However, other sizes are available too.
• Other sizes to choose from -15, 17, 19, 21, 24, 26, 27, 29, 30, 34, 36 mm one-piece flanges 

 For compatible valves, refer to product images.

How to choose the right size of breastshields for you?

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.

When it comes to pumping comfort, every millimeter counts.  That is why we design a series of breastshields of small increment sizes.  Maymom MyFit^TM one-piece breastshields are available in 15 (XXS-), 17 (XXS), 19 (S-), 21 (S), 24 (M), 25 (M+), 26 (L-), 27 (L), 29 (XL-), 30 (XL), 34 (XXL-), and 36mm internal diameters plus 22 mm and 28 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.