Tommee Tippee Advanced Anti-Colic Feeding Bottle, 340Ml X1 - BoyThe Unique 3 Piece Anti Colic Technology Draws Air Away From Milk And The Star Valve Keeps Milk From Travelling Up The Tube Meaning 80% Less Gas, Spit Up And Fussing. Includes Slow Teat 80% Less Colic Designed To Reduce Colic Symptoms For Less Gas, Less Spit Up And Less Discomfort. Unique 3 Piece Anti Colic Straw Draws Air Away From Milk. Star Valve Prevents Milk Travelling Back Up The Tube, So No Leaks And That'S A Promise. Heat Sensing Technology