Spill proof! Easy sip spout. Easy to clean one-piece valve. Special place to write your childs name. No slip grips. Shaped for little hands. Munchkin Healthflow spill proof cups are specifically designed for the different stages of your childs development. Munchkin Healthflow My First Cup is the ideal starter cup for your child: Unique ergonomic shape and no slip grip make the cup easier for little hands to hold; Easy-sip spout, shaped for young mouths, helps transition from bottles. For your older child try big kid cup. My First Cups and big kid cups and lids are interchangeable to meet your childs specific needs. Each cup features a special place to write your childs name. Replacement valves are sold separately.