Your options have never been better with Dr. Browns Natural Flow Anti-Colic Options+ Complete Bottle Set. The anti-colic internal vent system is clinically proven to reduce colic. Dr. Browns bottles provide a more comfortable feeding experience for baby by decreasing spit-up, burping and gas. This vacuum-free feeding is closest to breastfeeding and Dr. Browns silicone nipples provide a consistent flow so baby can feed at their own pace. The breast-like nipple shape encourages a proper latch for a more natural bottle feeding experience and eases the transition from breast to bottle and back again. Dr. Browns vent system is proven to help preserve bottle milk nutrients and aids in digestion for a better nights sleep. The silicone nipple, together with the internal vent system, offer a reliable and trusted bottle feeding experience that makes Dr. Browns the #1 Pediatrician Recommended Baby Bottle in the U.S.* Made to grow with baby, our bottle is designed to nourish through all of babys feeding stages and is recyclable. Safe for use in dishwasher (top rack only), electric and microwave sterilizers or boiling water. BPA Free.