The Peristaltic Plus Nipple is the ideal size and shape to fit into the mouth of the baby. The nipple has inner vertical lines that enhances its strength and makes it much more durable than the ordinary nipples. It also prevents the nipples from collapsing while the baby is feeding. Th e nipple comes with a textured surface, making it easy for the baby to latch on to it. Highly flexible and super soft, the Peristaltic Plus Nipple allows the baby to follow their natural tongue movement while they are feeding. The nipple comes with an Air Ventilation System which reduces air intake while feeding and also decreases the risk of colic among babies.