PIGEON Nursing Bottle with SofTouch™ Peristaltic PLUS Nipple ensures your baby gets your precious breast milk even when you are apart. It has Air Ventilation System (AVS™) that helps to adjusts air pressure inside the bottle. It consists of specially designed projections at the base and the top of the teats, allowing milk to flow smoothly into the baby’s mouth. The adjustment of the air pressure inside the bottle minimises air intake when feeding. Hence, baby will not swallow excessive air bubbles with milk. "• Peristaltic Nipple is 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 • Bottle is made from Polyphenylsulfone (PPSU) material with high heat resistance and excellent durability • BPA Free Size: 240ml Material: Polyphenylsulfone (PPSU) Sterilization Method: Boiling, Steam, Chemical"