Dr. Brown’s® Preemie Flow™ Narrow Nipple is our slowest-flow nipple, great for Preemies, newborns, and breastfed babies! Dr. Brown’s® uniquely designed Preemie Flow™ Nipple works together with our internal vent system to help babies feed at a pace that’s perfect for them. Each Preemie Flow™ 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 Preemie 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 night’s sleep. Suggested age range for the Preemie Flow Nipple is 0 months+, but baby’s preferred flow rate may vary. Made of super-soft, high-grade silicone, the Preemie Flow™ Nipple fits all Dr. Brown’s Narrow bottles. Dishwasher (top rack) and sterilizer safe. BPA free.