Help your little one comfortably transition from bottle to cup with the Dr. Brown's Wide-Neck 2-in-1 Transition Bottle Kit. The Dr. Brown's 2-in-1 Transition Bottle Kit is designed to grow with baby and easily converts from Options® bottle to sippy spout. When baby's ready, simply replace the vent and bottle nipple with the super soft sippy spout. The 100% silicone spout is gentle on little mouths and attaches and detaches from bottles in seconds. The 2-in-1 Transition Bottle Kit is easy to clean and is dishwasher safe (top rack only). Fits 5 ounce and 9 ounce Dr. Brown's Wide Neck Options bottles. BPA free.