I’m a lifelong stutterer yet when our daughter was 3-4 years old she started stuttering. Also my mother in law stuttered for many years. Of course I was scared and maybe horrified. What I didn’t know then was that many children go through that stage while learning to talk and it wasn’t a precursor of adult stuttering. By the age of 6 she was totally fluent. As an adult she has a career that involves public speaking. Btw. She has NO memory of not being fluent. Check the research of the development of speech. I was no expert, only a concerned mother.