Take baby steps to sippy cups with BeeBaby Advance+ Sippy Bottle Starter Kit. Transition from bottle to cup one step at a time with this nipple-to-sippy conversion. Using the BeeBaby Advance+ Narrow bottle that baby is familiar with, replace the bottle nipple with the super soft, 100% silicone sippy spout. Plus, it comes in a variety of cute colors and prints! The sippy spout fits in all 2 Oz. or 60 ml 4 Oz. or 120 ml and 8 Oz. or 250 ml BeeBaby Standard neck Feeing Bottle. Sippy Bottle Starter Kit is dishwasher (top rack) and sterilizer safe.