Compatible With All The Chicco Baby Bottles Of The Natural Feeling Line The Angled Teat Stays Full Of Milk And Allows For Natural Attachment And Sucking, Just Like A Mother'S Breast Protection From Colic: The Double Anti-Colic Valve Prevents Air Ingestion And Guarantees Protection From Colic And Regurgitation It Favors A Comfortable Position For Newborns And The Slow Flow Makes It Ideal For The First Feedings