The wide, soft and flexible nipple mimics the shape and texture of a woman's breast, helping the baby to suck in and drink calmly. The anti-colic valve keeps air away from the baby's tummy during feeding, reducing colic and discomfort. The teat opening has been designed so that the milk only flows out when the baby sucks. This ensures that the milk does not spill anywhere. Soft silicone. Bisphenol A*-free material. 2 pcs.