The OXO Tot Sippy Cup is a spill proof solution for teaching baby how to drink like a big kid. This Sippy Cup transitions into a Big Kid Cup as your baby grows. The Sippy Cup's valve is designed to be easy for liquid to flow when your little one is drinking, but is sealed tight when the cup is tipped, making it leakproof when it needs to be. The unique twist-in valve is easy to install and stays secure, even when the Cup is dropped (or thrown!).The angled sippy cup handles are made from soft non-slip material so it's easier for little hands to keep hold of, making it the ideal phase after bottle feeding, from around 6 months old. And when they've outgrown the handles, they can be removed. The Set also includes a Training Lid to mimic grown-up cups, and when your big kid is ready, the disk can be removed to be used as an open cup. The dimple in the lid makes room for little noses, whilst the crystal clear cup shows just how much liquid is left, with convenient measurement markings to help you know how much baby is drinking.