Level up to a faster teat flow! Dr. Brown’s Level 4 Narrow Teat is the fastest flow teat for babies 9m+. Dr. Brown’s uniquely designed Level 4 Narrow Teat is a fast-flow teat that works together with the internal vent system to help growing babies feed at their own pace. Each Level 4 Teat 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 4 Teat 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 night’s sleep. Made of super-soft, high-grade silicone, the Level 4 Teat fits all Dr. Brown’s Narrow bottles. The suggested age range for the Level 4 Teat is 9 months+, but baby’s preferred flow rate may vary. Dishwasher (top rack) and steriliser safe. BPA free. IT’S ALL ABOUT TEAT FLOW Each Dr. Brown’s Bottle Teat is uniquely engineered so that flow rates don’t change between same-level teats. That consistent, natural flow lets you find the right flow level for baby – and be sure it won’t change between same-level teats.