From 18 months and beyond, your little one is learning important new skills every day, including how to drink like a big kid. Designed to grow with your developing child, the 3-in-1 Insulated Convertible Cup has a unique lid that allows them to either drink from the straw, sip straight through the lid or gulp from an open cup. The free-flow lid is small enough for your childs mouth and helps them control their sips.