Dr Brown’s Natural Flow® Anti-Colic Options+ Wide-Neck Bottle Starter Kit includes 2 x 270ml wide-neck bottles, 1 x 150ml wide-neck bottle, 2 x level 2 teats, and 2 x level 3 teats. These bottles have an anti-colic internal vent system clinically proven to reduce colic, decreasing spit-up, burping and gas. The breast-like nipple shape encourages a proper latch for a more natural bottle-feeding experience and eases the transition between breast and bottle. While the silicone nipple provides a consistent flow so baby can feed at their own pace.