This nipple shield has a unique size (see photos). While it is suitable for the majority of mothers, it will not fit every one. Please consult with your lactation professional for assistance. All Maymom products that come in contact with breastmilk are and always have been made without BPA. If breastfeeding is uncomfortable due to sensitive nipples, try this Nipple Shield. This Nipple Shield has a unique natural shape that maximizes mother-baby contact while protecting sensitive nipples. The super-soft silicone clings to the breast and has soft nodules for gentle stimulation. Buying Maymom's product is satisfaction guaranteed!