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 turns straw pink when baby's feed is too hot Award-winning breast-like nipple for natural latch and guaranteed acceptance* There's nothing a parent wants more than for their baby to be comfortable. That's why we've combined our award-winning breast-like nipple with the latest in anti-colic innovation to create the new Tommee Tippee Advanced Anti-Colic bottle. The unique 3-piece anti-colic technology draws air away from milk and the star valve keeps milk from traveling up the tube meaning 80% less gas**, spit-up and fussing. And 100% more smiles. Plus, a built-in heat sensing straw gives you extra reassurance that your milk is just the right temperature so both you and baby can feed comfortably. This Newborn Starter Set contains 2 X 5 oz. Advanced Anti-Colic Bottles (with Slow Flow Nipples), 2 x 9 oz. Advanced Anti-Colic Bottles (with Slow Flow Nipples), 2 Storage Inserts, 2 x 0-3 mo. Every Day Pacifiers, 2 x Medium Flow Advanced Anti-Colic Nipples, 2 x Milk Powder Dispensers, 2 Storage Lids, 1 Bottle and Nipple Brush. **We consulted 210 parents who tried using this product to reduce their child's colic symptoms, 80% of them agreed the bottle had successfully reduced the symptoms (June 2017)