80% less colic- Designed to reduce colic symptoms for less gas and less discomfort. Unique 3-piece anti-colic straw draws air away from milk. Star valve prevents milk from traveling back up the tube, so no leaks. Heat sensing technology turns straw pink when baby's feed is too hot. 3 way, easy-hold bottle with slow-flow nipple for newborn babies. Always BPA and phthalate free for ultimate reassurance. Advanced Anti-Colic Bottles are only compatible with Advanced Anti-colic Nipples.