Philips Avent's Glass Natural bottle features a Natural Response nipple, allowing your baby to regulate milk flow like during breastfeeding. The nipple's unique design releases milk only when your baby drinks, preventing leaks when pausing. The wide, breast-shaped nipple mimics breastfeeding, promoting easy combination feeding. Its no-drip design ensures no milk is wasted, while an anti-colic valve reduces discomfort by diverting air away from your baby's tummy. The bottle's ergonomic shape ensures comfortable handling, and its wide neck simplifies filling and cleaning. Crafted from premium, BPA-free borosilicate glass, it's heat and shock-resistant, safe for fridge storage, warming, and easy to clean and sterilize. Natural response nipples are available in flow rates 1-5 to accommodate your baby's growth. We recommend using these bottles with Philips Avent Natural bottle nipples.