Favorite Disney characters will make this your little one’s favorite cup. These 9 oz. cups feature double layer insulation to keep liquids cold for longer and a sweat-proof design that makes the cup easier for kids to grip. Moms will love the easy-to-clean One Piece Lid, with built-in valve and no small parts to lose. And to make life even easier, all of The First Years reusable cups with One Piece Lid are interchangeable—which means you can keep the cup even when your child has grown out of a sippy cup spout. Age: 9 months and up.