This is no ordinary bottle. Tommee Tippee Advanced Anti-Colic baby bottles work a little differently from regular bottles to help combat colic while ensuring a comfortable feeding experience for you and your baby. It has a nipple that’s Closer to Nature because of its breast-like shape to help your baby have the most natural bottle-feeding experience.The unique 2-piece, anti-colic venting system draws air away from milk and the star valve keeps milk from traveling up the tube meaning less wind, reflux and discomfort. Our Advanced Anti-Colic bottles are scientifically proven to be the best for reducing baby’s feeding discomfort† and that’s why 95% of moms who used them agreed they reduced their baby’s colic symptoms*. Thanks to its brand-new design, the Advanced Anti-Colic baby milk bottle is now self-sterilizing, making clean-ups a whole lot easier. Follow these simple steps to sterilize your bottle in the microwave in just 3 minutes**:Step 1: Thoroughly clean your bottle in warm, soapy water and rinseStep 2: Fill the bottle with 50ml of cold waterStep 3: Loosely place the nipple, screw ring and cap back onto the bottle and pop in the microwave for 3 minutesStep 4: Remove the water inside the bottle and reassemblePlease note that the time to sterilize will change slightly based on how many bottles you place in the microwave at once.For added peace of mind, the Advanced Anti-Colic baby bottle is completely mess-free and leakproof when the screw ring, nipple and cap are all secured (even if it’s turned upside down or shaken). It’s also 100% BPA free so it’s safe for your baby.However you choose to feed your baby - whether it’s breast milk, formula or a bit of both - our Advanced Anti-Colic bottles are #1 for helping to ease the discomfort of colic, gas and reflux††. *Based on an independent survey of 43 US moms of 0-12m, currently use TT AAC, Feb 2023**Based on placing one bottle in microwaves from 700-1000w. Sterilizing time increases with every bottle added to the microwave.***Tested against pseudomonas, E.coli, staphylococcus and aspergillus brasilliensis. †In testing vs. 10 leading bottles, AAC valve requires less force to activate, reducing discomfort caused by effort ††In an independent survey of 1,006 UK mums in Feb 2023, more would recommend TT AAC for easing discomfort of colic, gas & reflux than any other bottle