· · LESS COLIC. MORE SLEEP. Help your child sleep with the Anti-Colic Glass Bottles for baby from Dr. Brown’s! Our Options+ glass bottles for breastfed babies provide a consistent flow so babies feed at their own pace. This vacuum-free feeding helps digestion for a good night’s sleep.· EFFECTIVE SYSTEM. Our baby glass bottles feature a vent system that is clinically proven to reduce colic. Dr. Brown’s glass bottles better preserve nutrients in milk and help decrease spit-up, burping and gas· · HIGH-QUALITY AND DURABLE. These gas relief baby bottles are stain and odor resistant and made of BPA-free glass.· · SUSTAINABLE BABY SUPPLIES. Made with 100% recyclable glass and designed for eco-conscious parents, these glass bottles for babies are naturally free of toxins and chemicals and can last for years and through multiple babies by replacing the bottle nipple.· · EASY-TO-CLEAN BABY BOTTLE. This baby glass bottle fits most breast pumps and is top-rack dishwasher safe. Dr. Brown’s glass bottles are made to withstand high temperatures and will not lose their shape in steam sterilizers.