Many children stutter bcz they are not fluent enough to process new words that quickly and most of them outgrow it. The only ones who don’t get over it are the ones that have social anxiety. The more you fear of getting made fun of, the more you stutter. Don’t let these people tell you that people who stutter have a damaged brain part, Its all non-sense. No one ever really cared to do a proper research on stutter. Stutter is just a form of shyness, you can make yourself get over it and you can do it by practice only.