In the case of breastshield sizing - it is all about the nipples, primarily the diameter of the nipple, as well as the nipple elasticity. (motifmedical.com)
If the pain does not subside, try using another size of breastshield or seeking help from a lactation consultant. (motifmedical.com)
It's tough to find replacement values, membranes, tubing, personal fit breastshields in various sizes, replacement AC adaptors, cleaning supplies and other parts for Medela and Ameda breastpumps. (mamanista.com)