Maymom MyFitTM one - piece breastshields are available in 15 (XXS --RRB-, 17 (XXS), 19 (S --RRB-, 21 (S), 24 (M), 25 (M +), 26 (L --RRB-, 27 (L), 29 (XL --RRB-, 30 (XL), 34 (
XXL --RRB-, and 36 mm internal diameters plus 22 mm and 28 mm inserts to fit the majority of breast pumping
mothers.