Dr Brown\'s Options+ Baby Bottles 4 Pack contains 4 convertible bottles that can be used with or without the vent system, preventing wind-related colic. Dr Brown\'s Options+ Anti-Colic 270ml Bottles Four Pack is clinically proven to reduce windy colic due to Dr Brown\'s unique 100% vacuum-free vent system. Dr Brown\'s Options+ bottles offer an easy and comfortable way to feed your little-one, adapting to their needs as they grow. 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. Dr Brown\'s Options+ bottles are suitable from birth 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. Each teat is specially engineered to offer the same consistent natural flow, so you and baby know what to expect in every feed. Key features of Dr Brown\'s Options+ Anti-Colic 270ml Bottles Four Pack Dr Brown\'s unique 100% vacuum-free vent system Can be used with or without the removable internal vent system Breast-like teat shape Easy to use