- 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 Bottle Nipple comes in Flow - Anti-colic valve is designed to reduce colic and discomfort by sending air away from your baby's tummy - Best Glass Baby Bottle Brand winner in the 2022 What to Expect Feeding Awards.