The Adiri Natural Nurser Ultimate Bottle is 100% polycarbonate-free and bisphenol-A free. It offers high quality materials, a graceful design, and the new Fill, Twist and Feed? system, engineered so that a parent or caregiver can quickly prepare a bottle, even with a hungry infant under one arm. A sleek cover protects the bottle from getting dirty and keeps the nipple from leaking during transport. The Adiri Natural Nurser comes in three stages for three different flow rates. Each stage holds 8 oz. of fluid and is dishwasher safe! 1 Bottle Per Pack. Stage 1 - Ages 0-3 mos., Stage 2 - Ages 3-6 mos., and Stage 3 - Ages 6 mos. and up.