what age are sippie cups suitable for?

That depends. Sippie Lids are designed to fit our Grip Cups (or any other cup with 69-75mm diameter) and turns these into no-leak toddler solutions. So as soon as your munchkin is ready to use a standard drink bottle, they’re ready for a Sippie Lid. They’re intended to be a more hygienic take on a standard drink bottle or as a cure for your dinnertime headaches when you just want to reduce the risk of spillage. We’d say you’re never too old for a Sippie Lid!