Your options have never been better with Dr. Brown's Natural Flow Options+ Glass narrow baby bottle. From nipple to base, the Options+ bottle makes for a comfortable feeding experience for baby. Starting at the top, each nipple is specially engineered to offer the same consistent, natural Flow, so you and baby know what to expect in every feeding. The soft silicone nipple helps baby naturally LATCH while the anti-colic vent system lets baby feed without fuss. Together, they offer a reliable and trusted bottle feeding experience that makes Dr. Brown's the #1 pediatrician recommended bottle in the U.S. Plus, our glass bottles are made of pharmaceutical-grade borosilicate glass that is heat and thermal shock-resistant - which can withstand hot and cold temperatures, along with gradual temperature changes.