Pigeon Official - Wideneck Plus Nipple 3L Size for 15+months, no nipple confusion, anti-colicPigeon peristaltic nipples are developed based on 3 key steps of sucking. Latching this is when the lips open outward and latch on to the areola. Peristaltic tongue movement this is the "wave like" tongue movement that squeezes the nipple and then extracts milk. Swallowing the back of the tongue rises, channeling the milk into the esophagus. Pigeon peristaltic nipple promotes no nipple confusion, so weaning baby from latching will be less stressful