DR Browns Options+ Anti Colic Narrow Neck Starter SetYour options have never been better with Dr. Browns Natural Flow Options+ Narrow Baby Bottle. From teat to base, the Options+ Bottle makes for a comfortable feeding experience for baby. Anti colic vent system is clinically proven to reduce colic Decreases spit up, burping, and gas Shown to better preserve nutrients in breast milk and formula Aids in digestion for good nights sleep Offers flow rate that supports breastfeeding Each teat is engineered