Stage 1: use the step by step potty as a stand-alone potty. it includes a soft contoured seat for added comfort. Stage 3: for added convenience, the base of the step by step potty transitions into a stepstool allowing your toddler to reach either the toilet or bathroom sink to promote good hand washing habits. 3-stage potty: the summer step by step toddler toilet and stepstool is a complete 3-stage potty-training system. designed to grow with your child, it makes transitioning to an adult toilet easier. Stage 2: when it’s time to transition to an adult toilet, simply snap off the toilet topper from the potty and place it securely onto a standard toilet. Additional features: the step by step potty training toilet includes a flushable wipes holder and toilet tissue dispenser for added convenience.