Roughly 8-9% of young children have a speech sound disorder, which results in difficulties producing speech sounds correctly and often has no known cause, according to the National Institute on ...

This rare speech motor disorder prevents effective speech planning, leaving some children persistently difficult to understand without specialist support.

Childhood apraxia of speech (CAS) is a developmental disorder in which the precision and temporal coordination of the movements required for speech are impaired, despite normal neuromuscular function.