Take baby steps to sippy cups with Dr. Brown's 2-in-1 Transition Bottle Kit. Transition from bottle to cup one step at a time with this nipple-to-sippy conversion. Using the Dr. Brown's Option's bottle baby is familiar with, just remove the vent and replace the bottle nipple with the super soft, 100% silicone sippy spout. The sippy spout fits both 4 oz/120 ml and 8 oz/250 ml Dr. Brown's Options bottles. The 2-in-1 Transition Bottle Kit is dishwasher (top rack) and sterilizer safe. Kit includes an 8 oz/250 ml Options bottle with level 3 nipple and a bottle sippy spout. BPA free. 6m+.