Tommee Tippee Closer to Nature Variable Flow Nipples are uniquely designed for your baby. The natural shaped Closer to Nature nipple mimics the natural feel, flex and movement of breastfeeding, similar to mum's own natural feeding action, and provides for easy latch-on, so baby can easily switch between breast and bottle feeding. The super-sensitive anti-colic, anti-gas valve helps reduce gas and colic when feeding. Contains 2 Variable Flow nipples, for babies 0M+. Only suitable for use with Tommee Tippee Closer to Nature bottles. BPA free.