Introduction Speech sound disorders (SSDs) are difficulties with perception, motor production, or phonological representation of speech sounds, encompassing both articulation errors (specific sounds) and phonological processes (systematic patterns). In the United States, SSDs affect roughly 5‑8 % of preschool‑aged children, with estimates ranging from 2‑23 % in 4‑ to 6‑year‑olds and about 3.6 % persisting into grade 8. Boys […]