Dr. Brown's Natural Flow® Anti-Colic Options+™ Wide-Neck Glass Baby Bottles are designed to provide a comfortable feeding experience for your baby. The anti-colic internal vent system is clinically proven to reduce colic, spit-up, burping, and gas. These bottles feature a breast-like nipple shape that encourages a proper latch, making the transition from breast to bottle easier. The vacuum-free feeding mimics breastfeeding, allowing babies to feed at their own pace. The bottles are made from heat and thermal shock-resistant glass, ensuring durability and safety. They are also recyclable and dishwasher safe (top rack only), making them a sustainable choice for parents.