The Philips Avent Glass Natural bottle with Natural Response nipple allows the baby to regulate milk consumption at their own pace, similar to breastfeeding. This premium quality borosilicate glass baby bottle is BPA free, heat and thermal shock resistant, and easily washable and sterilizable. The wide breast-shaped nipple with a soft feel facilitates a seamless transition between breast and bottle feeding. The no-drip nipple design prevents milk wastage, and the anti-colic valve reduces discomfort by directing air away from the baby's tummy. The box includes 4 4oz Natural Glass bottles with Flow 2 Natural Response nipples.