"Munchkin Latch nipples made of the finest materials, very flexible, move with the baby's mouth, simulate natural feeding, designed in the shape of an accordion, stretch and move like the breast, BPA-free, and it is the second level nipple for flow and prevents air from entering the baby in order to protect it from bloating and colic. Number of two pieces from the age of three months from Munchkin Pack of 2 BPA free nipples The nipple expands like the breast, helping the baby to latch on properly Oral pressure on the nipple releases milk as the baby sucks just like the breast The nipple moves forward and sideways like an accordion BPA and phthalate free Top rack dishwasher safe Innovative design to achieve the comfort of mother and baby in feeding The flexible nipple moves just like the breast and comforts the baby Helps the infant to continue to latch on to the nipple It prevents the entry of gases Machine washable Simulates breastfeeding"