Here we present the case of a child who visited the university with the chief complaint of dysarthria. He initially suffered from dysarthria and mild mental retardation, but later developed serious problems with reading and writing. We considered his phonological processing ability and a possible connection with developmental dyslexia. The child was a 7-year-old boy who was in second grade at a regular elementary school. At 5 years of age, he was diagnosed with a submucous cleft palate and underwent surgery to correct this. After surgery, he was evaluated and started receiving training. He was diagnosed with language delay due to mild mental retardation and dysgraphia accompanying underdeveloped dysarthria, and received 7 months of ST train...