Feeding baby thicker liquids? Get the Dr. Browns Y-Cut Narrow Nipple for improved flow rate. Dr. Browns uniquely designed Y-Cut Narrow Nipple works together with our internal vent system to help growing babies feed at their own pace with thickened milk, formula, or cereal. Each Y-Cut Nipple provides the same consistent flow rate, so both you and baby know exactly what to expect. Together with the anti-colic internal vent system, the Y-Cut Nipple offers vacuum-free feeding that is clinically proven to reduce colic, decreases spit-up, burping and gas, better preserves nutrients, and aids in digestion for a good nights sleep. Made of super-soft, high-grade silicone, the Y-Cut Nipple fits all Dr. Browns Narrow bottles. Dishwasher (top rack) and sterilizer safe. BPA free.