Pigeon Peristaltic Plus Silicone Nipple 2pcthe nipple is ideally shaped and sized to fit the sucking position of baby’s inner vertical lines giving it a textured surface that is resistant to loosening and allows baby to easily latch onto the ultra-soft and flexible 100% silicone nipple. The ventilation system, which is compatible with the natural and smooth movement of the infants tongue, reduces his absorption of gases that may cause colic.