*Bottle is made from Polypropylene (PP) material which is durable and lightweight. *Air Ventilation System (AVS™) reduces intake of gas, a potential cause of colic *Pigeon Wideneck Peristaltic Plus Bottles promotes "NO NIPPLE CONFUSION". It means that your baby can alternately do breastfeeding and bottlefeeding. *Pediatricians & Childbirth experts are now recommending Pigeon Wideneck Peristaltic Bottles because of its NO NIPPLE CONFUSION feature. Pigeon Wideneck baby bottles are made of Polypropylene (PP) material which is light for those little hands to grasp. With its ultra-soft silicone teat, this helps your little one gently transition from breastfeeding to formula feeding during the weaning stage. No stress for mommy and no nipple confusion for baby. Recommended by Pediatricians and Childbirth Experts worldwide. Celebrate babies the way they are and give the best quality feeding bottle.