Medela Contact Nipple Shields can be an effective tool for professionals and parents to manage infants with latch-on problems, for those with overactive let-downs or for flat, inverted and sore nipples. Medela Nipple Shields may enable continued breastfeeding without interruption until these problems are resolved. Available in different sizes (16 mm, 20 mm, 24 mm). Nipple shield sizing will depend on the size of the infant's mouth. The use of nipple shields should be discontinued once problems are resolved. Use under the direction of a physician, Lactation consultant or other health professional. Unique cut-out area allows more skin contact between parent and baby. For flat or inverted nipples For latch-on difficulties For overactive let-down Made of pure silicone Includes two nipple shields and a convenient carrying case. All parts that touch breast milk are made without BPA and safe for parent and baby.