Tommee Tippee Advanced Anti-Colic bottles work a little differently from regular bottles to help combat colic while ensuring a comfortable feeding experience for you and your baby. The unique 3-piece anti-colic venting system draws air away from milk and the star valve keeps milk from traveling up the tube, meaning less gas, reflux and discomfort – 84% of moms who used our Anti-Colic bottles agreed they reduced their baby’s colic symptoms.* Plus, the anti-colic venting tube comes with a built-in heat sensing strip. Loved by moms and babies, our easy latch-on, breast-like nipple mimics the natural flex and movement of a mom's breast for comfortable feeding. 95% of moms reported that their baby accepted the silicone nipple and would recommend to others.* Suitable for use in the dishwasher, microwave and steam sterilizers. 100% BPA-free for complete peace of mind. * Based on 2021 study of 524 parents who use Tommee Tippee bottles.