Your options have never been better with Dr.Brown's Natural Flow Options+ Glass Wide-Neck Bottle. From nipple to base, the Options+ Wide-Neck Bottle makes for a comfortable feeding experience for the baby and eases the transition from breast to bottle and back again. Starting at the top, each nipple is specially engineered to offer the same consistent, natural flow, so you and the baby know what to expect in every feeding. The new breast-like nipple shape is correctly contoured for a proper latch and a more natural bottle feeding experience - perfect for switching from breast to bottle and back again! Together with the anti-colic internal vent system, the baby feeds without fuss. Plus, our glass bottles are made from borosilicate glass that is heat and thermal shock-resistant – which can withstand hot and cold temperatures, along with gradual temperature changes. But it doesn't stop there. The anti-colic internal vent system features an enhanced design to improve an already innovative feeding experience.