S.S.
My son was very hard to understand, but had never stuttered until he started preschool. There were some big changes going on with my family and a new relationship, and since he had never been to daycare, it was his first experience with a classroom setting and organized instruction. He stuttered and stammered for several weeks and just when I started to seek help and advice I noticed he was doing it less and less. I tried not to make a big deal about (although it was driving me CRAZY!)and he eventually stopped altogether. When his grandfather died several days before this past Christmas he stuttered several times while trying to tell a story, but it did not come back. I would just give it some time and let him adjust to the changes. Good Luck!