The Pigeon slim-neck feeding milk baby bottle (Glass) encourages baby to use natural sucking pattern. Its Peristaltic Nipple is ultra soft and flexible to allow for natural and smooth tongue movement. Its Air Ventilation System reduces intake of gas, a potential cause of colic. This bottle is made from premium borosilicate glass material with excellent transparency and high heat resistance. BPA free. Available in two sizes – 120ml and 240ml.