. Dr. Brown's is famous for its baby bottles with their patented two-piece internal vent system which fully vents the bottle for vacuum free feeding. This way, air never mixes with the milk minimizing oxidation and helping to maintain nutrients like vitamins C, A and E. The vent system allows babies to feed without the interference of vacuum or air bubbles; this reduces problems like colic, spit-up, burping and gas. Apart from bottles, Dr. Brown's manufacturers Natural Flow Manual Breast Pump and Dr. Brown's Natural Flow Electric Breast Pump which are acclaimed for their Whittlestone Hospital Technologies that they are based upon