With the unique design, this bottle can be used with or without the removable internal vent system, transforming it into a teat-vented bottle for more convenience. Features: The unique internal green vent system continues to create 100% vacuum free feeding, which is clinically proven to help reduce wind related colic. This is what makes Dr Brown’s the number one choice of UK Health Professionals for the relief of colicky symptoms The breast-like teat 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! Each teat is specially engineered to offer the same consistent natural flow, so you and baby know what to expect in every feed Dr Brown’s Options+ grows with baby, allowing easy removal of the vent system when baby no longer experiences feeding problems or you want the convenience of a teat-vented bottle. The teat venting creates a controlled flow, offering babies an easy and c