Level up to a medium nipple flow rate! Dr. Browns Level 2 Narrow Nipple is the next step up in nipple flow for babies 3m+. Dr. Browns uniquely designed Level 2 Narrow Nipple is a medium-flow nipple that works together with our internal vent system to help growing babies feed at their own pace. Each Level 2 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 Level 2 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 Level 2 Nipple fits all Dr. Browns Narrow bottles. The suggested age range for the Level 2 Nipple is 3 months+, but babys preferred flow rate may vary. Dishwasher (top rack) and sterilizer safe. BPA free.