Mamivac Conical Nipple Shield is a silicone nipple that is placed over the maternal nipple to make it easier for the infant to latch. For mothers with true inverted nipples or infants with oral abnormalities, this is a good way to facilitate breastfeeding until the time is given to correct the essential problem. Mamivac Nipple Shields come in multiple sizes and shapes, Small Cherry, Medium Cherry, Small Conical, Medium Conical, Large Conical. Sizing Information: Moms are encouraged to buy and use nipple shields with the assistance of a lactation consultant or a healthcare specialist. Two factors should be taken into consideration when purchasing a nipple shield: first, the nipple shield should fit tighter than a breast flange and the size of the baby's mouth should be taken into consideration. Second, the nipple shield should be about 1-2 mm bigger than the diameter of the nipple. For example, a 16mm diameter nipple can use an 18mm nipple shield. <br><br> Owned and operated by fellow moms, lactation consultants, and registered nurses, Spectra is committed to supporting every mother on the beautiful journey of breastfeeding. From our unique Natural Nursing Technology to our one-of-a-kind customer care, you can count on Spectra to be right there with you, every step of the way. We are moms. We are nurses. We understand.