The Philips Avent Glass Natural bottle, featuring the Natural Response nipple, allows babies to regulate the milk flow, similar to breastfeeding. Constructed from premium quality borosilicate glass, this BPA free bottle is resistant to heat and thermal shock, making it suitable for refrigeration, heating, and easy cleaning and sterilization. The wide breast-shaped nipple mimics the feel of a breast, making it easy to transition between breast and bottle feeding. The no-drip nipple design prevents milk wastage, while the anti-colic valve decreases colic and discomfort for your baby by redirecting air away from their tummy.