Hello, It's great that you are actively helping your son. To support him, try engaging in interactive play with toys and books to keep him focused. Incorporate short, frequent practice sessions into daily routines and always praise his efforts and progress to build his confidence.Model fluent speech by speaking slowly and clearly yourself, and create a relaxed environment to reduce pressure when he speaks. If he's not very aware of his stuttering, it's better to help him indirectly by modifying his daily environment and your own speech to be slow and flowing. Activities like storytelling and singing can also be fun. Consistency is the key for the progress. Best wishes for your son's progress.