Use stage 3 when your baby is sitting with confidence and control – usually around 1 year old. Babies at this stage are eager to show you all the cool things they can do. Stage 3 allows your baby to have the unstructured time and space to discover and explore the amazing world of water. Make this kind of free play a part of your baby’s routine. With Stage 3 water play doesn’t depend on warm weather and an outdoor pool.