Philips Avent Glass Natural baby bottle with the Natural Response nipple lets baby control the pace of the milk, like they do when breastfeeding This Natural Philips Avent baby bottle is made of premium quality borosilicate glass, a BPA free material; It is heat and thermal shock resistant, so it can be safely stored in the fridge or warmed and is easy to wash and sterilize Bottle makes it easy to combine breast and bottle feeding with a wide breast-shaped nipple that has a soft feel that mimics the shape and feel of a breast No-drip nipple design helps prevent lost milk from the tip of the baby bottle, giving you peace of mind Anti-colic valve is designed to reduce colic and discomfort.