Pigeon Glass bottle with handle and nipple encourages the baby to use natural sucking pattern for feeding. It has a handle for easy grip and peristaltic nipple which allows medium flow. This feeding bottle is made from premium borosilicate glass material with excellent transparency and high heat resistance. BPA Free for baby care. How does this work? -Peristaltic nipple- Ultra soft and flexible to allow for natural and smooth tongue movement. -Air Ventilation System (AVS) -Reduces intake of gas, a potential cause of colic