Natural feel nipple is just like Mom Easy latch nipple for smooth transition between breast and bottle Optimum venting valve with slow flow nipple for less air intake and less discomfort for baby Easy hold design and accurate feeding and measurement markings on bottle BPA Free Closer to Nature bottles are intuitively designed for easier and more natural feeding. The unique, natural shaped nipple mimics the natural feel, flex and movement of breastfeeding, similar to mum's own natural feeding action. The super-sensitive anti-colic, anti-gas valve helps reduce gas and colic when feeding. All features combined provide baby the most natural alternative to breast feeding and allows mum to successfully combine breast and bottle feeding. Contains 1 - 9oz bottle with Slow Flow nipple. BPA and Phthalate free.