Absolutely don't correct a child that's stuttering. You shouldn't ever correct anyone that's stuttering, and especially a child. For parenting, I recommend the Parenting with Love and Logic methodology. My brief summary of that program is, "Kids never do what you tell them to do. But they'll always try to model what they think you're doing." So basically, the danger of you correcting your son is that what you're basically teaching him is that he should be critical of others when they exhibit something he thinks isn't normal. Plus, corrections don't work at all with stuttering. Most speech therapy for stuttering takes the opposite approach. From your example, it's tough to tell if he's stuttering or cluttering. If his speech is like, "I w..w..w...want th...th...that," then that's more similar to stuttering, and if his speech is like "I want...want...want that" or "I want...I want...I want that" then it's more similar to cluttering. The common usage of the word "stuttering," said by people that don't stutter, is actually more describing cluttering. "I was so nervous about my presentation that I stuttered all the way through it. That hasn't happened since I was in high school." That usage is more describing cluttering than stuttering. The reason I mention that, is that cluttering is a normal development process in speech development as kids grow up. But assuming he's stuttering, then you should take him to a speech therapist. And ask the speech therapist to train you on how to best help him. And read a lot of the old posts on this sub, because there are a lot that describe what's helpful and what's not, for people who stutter.