Pigeon Softouch Peristaltic Plus Wide Neck Nipple Large Size 2 Pcs stretchable nipple that contains nipple suits the sucking fossa of babies in ideal form and size. Vertical internal lines of Pigeon Peristaltic Nipple improve nipple structure making them resistant to collapse. Textured surface of Peristaltic nipple makes it simple and safe that baby holds on. Super soft and flexible silicone nipple, allowing normal and smooth movements of the tongue.