Reduces colic and discomfort: the anti-colic valve keeps air away from your baby's tummy for your and your baby's well-being The nipple shape allows a secure latch and the ribbed texture helps prevent collapse for uninterrupted, comfortable feeding; these BPA-free nipples are Flow 1 Paper-based packaging, 80% less carbon footprint: 100% responsibly sourced paper packaging which results in 300 tons less plastic per year¹ and 88% less fossil fuel use² Replacement Philips Avent nipples for Philips Avent Anti-colic baby bottles come in flows 1-4, to keep up with your baby's growth; choose the Philips Avent nipple flow that best fits your baby The set includes: 4x Philips Avent Anti-colic nipples, Flow 1