Pigeon Softouch Nursing/Feeding Bottle made from non-toxic international quality borosilicate glass for safety and durability Pigeon Softouch Nursing/Feeding Bottle fits perfectly in the sucking fossa of the baby mouth Pigeon Softouch Nursing/Feeding Bottle Inner vertical lines for nipple collapse and resistant help natural toungue movement for babies Pigeon Softouch Nursing/Feeding Bottle clinically tested for seamless switch between breast and bottle Comes with Anti-colic system