Pigeon Peristaltic nipple with its Air Ventilation System helps to adjusts air pressure inside the bottle. Specially designed projections at the base and the top of the teats allow milk to flow smoothly into the baby 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. Features:- 1) Wide-based Nipple :- The nipple's wide base helps baby to open his or her mouth widely, encouraging steady peristaltic motion. 2)Wide-neck Streamline Bottle :- The streamlined shape makes it easy for mothers to hold and keep clean. Made of high quality durable plastic, the wide-neck opening makes preparation of formula milk for baby simple. 3)Standard-neck Bottles (Ultra-Soft Silicone):- Silicone rubber with its double thickness ensures ideal softness and elasticity so that your baby can latch on comfortably and easily. The shape fits perfectly onto your baby's tongue, allowing smooth tongue movement and minimising air intake.