From teat to base, the Options+™ Wide Neck Bottle makes for a comfortable feeding experience for baby and eases the transition from breast to bottle and back again. The breast-like shape is correctly contoured for a more natural bottle-feeding experience. The anti-colic vent system is clinically proven to reduce colic. May help to decrease spit-up, burping, and wind. Each teat is engineered for consistent flow, so you and baby know what to expect. Use bottle with or without the internal vent system.