The Dr Brown's Options+ range features a unique internal vent system that channels air away from baby’s feed, as air can cause colicky symptoms. This anti-colic vent system is clinically proven to reduce colic. It also includes a contoured breast-like teat for a proper latch and a more natural bottle-feeding experience, which aids in digestion for a good night’s sleep. There are two vent options, offering one proven bottle. This means there is no need to introduce a different bottle once baby grows out of colic. The bottles are also dishwasher (top rack) and steriliser safe.