Dr. Brown'S Natural Flow Level 1 Narrow Baby Bottle Silicone Nipple, Slow Flow The Dr. Brown's Natural Flow Level 1 Narrow Baby Bottle Silicone Nipple in Slow Flow is a BPA-free, dishwasher-safe product designed for vented feeding. Made from 100% silicone material, this baby bottle nipple is suitable for infants aged 0 months and above. It comes in a pack of 6 and is easy to clean, making it a convenient choice for parents looking for a safe and reliable option for their little ones. With its slow flow design, this nipple helps regulate feeding speeds and promotes healthy feeding habits.