DS4 benefited from a brief round of speech therapy for stuttering this year. His came on strong and he became very upset by it quickly, despite patience from others and explanation at home when he needed it. It also faded quickly. Now he experiences mild dysfluency only intermittently, and usually when he seems like he seems to be mentally ascending a plateau or stressed out/ anxious. We still use the techniques the therapist gave him e.g. bridging and slowly pronouncing each syllable like a robot when he needs them. He isn't upset by it anymore. I worry about it presenting a barrier in the future but am hopeful he will grow out of it. At least he's learned how to appreciate it for what it is and conscientiously tackle it when it rears up. The pediatrician referred him because of his strong early and sustained language capability as well as how emotionally effected he was by it. From what I've read about it, as has been said, during preschool years it's usually a developmental phase and not something to be worried about as long as the child isn't worried about it and /or it doesn't persist for several months. Good luck.