Your options have never been better with Dr. Browns Natural Flow Options+ Wide-Neck Bottle. From nipple to base, the Options+ Wide-Neck Bottle makes for a comfortable feeding experience for baby and eases the transition from breast to bottle and back again. Starting at the top, each nipple is specially engineered to offer the same consistent, natural flow, so you and baby know what to expect in every feeding. The NEW breast-like nipple shape is correctly contoured for a proper latch and a more natural bottle feeding experience - perfect for switching from breast to bottle and back again! Together with the anti-colic internal vent system, baby feeds without fuss. But it doesnt stop there. The anti-colic internal vent system features an enhanced design to improve an already innovative feeding experience: Cinically proven to reduce colic Decreases spit-up, burping, and gas Shown to better preserve nutrients in breast milk and formula Aids in digestion for a good nights sleep Offers a flow rate that supports breastfeeding.