Features: Nipple Is Of Perfect Shape And Size To Fit Into The Sucking Fossa Of Baby Inner Vertical Lines Makes It Collapse-Resistant Textured Surface Allows Baby To Latch On Easily 100% Silicone Nipple,Super Soft And Flexible, Allows Natural And Smooth Tongue Movement Air Ventilation System (Avs) Reduces Intake Of Gas, A Potential Cause Of Colic Description: A Research-Based Innovation Designed To Enable Baby To Replicate Natural Sucking Pattern Learned At The Breast. It Caters To The 3 Key Steps When A Baby Sucks: Latching On, Peristaltic Tongue Movement And Swallowing. By Having A Smooth Transition Between Feeding From Breast To Bottle, Mums Need Not Worry For The Issue Of Nipple Confusion.