p to medium nipple flow rate! Dr. Brown?s Level 2 Nipple is the next step up in nipple flow for 3m+. Dr. Brown?s uniquely designed Level 2 Nipple is a medium-flow nipple that works together with our patented internal vent system to help growing babies feed at their own pace. Each Level 2 Nipple offers the same consistent flow, so both you and baby know exactly what to expect. Made of super-soft, high-grade silicone, the Level 2 Nipple fits Dr. Brown?s Natural Flow Original Wide-Neck Bottles . The suggested age range for the Level 2 nipple is 3 months+ but baby?s preferred flow rate may vary. Easily clean this dishwasher (top rack) and sterilizer safe nipple. BPA free.