The Dr Brown's Options+ range feature an unique internal vent system that channels air away from baby’s feed as air can cause these colicky symptoms. Anti-colic vent system is clinically proven to reduce colic Contoured breast-like teat for a proper latch and a more natural bottle-feeding experience Aids in digestion for a good night’s sleep Two vent options. One proven bottle. No need to introduce a different bottle once baby grows out of colic. Dishwasher (top rack) and steriliser safe.