First, there obviously is no “guaranteed” outcome for a child with apraxia of speech. However, many, many children can learn to speak quite well and be entirely verbal and intelligible if given early appropriate therapy and enough of it.
However, children with apraxia of speech often make slower progress than children with other types of speech sound disorders. (Note: slower than other types of disorders; not slow in and of itself.)
Children suspected to have CAS but who make very rapid progress in speech therapy that generalizes easily to new contexts, both in and outside of the therapy room, most likely have a different type of speech sound disorder and NOT CAS..
With appropriate goals, informed by detailed assessment – AND – appropriate, well executed speech therapy that incorporates principles of motor learning, children with apraxia of speech can be expected to make good, steady progress in therapy, especially those with age appropriate or near age appropriate cognitive, behavior and language skills.
Neither parents nor SLPs should blindly accept that, “progress will be or is slow because the child has apraxia.”
Speech progress may be very slow, even with appropriate planning and therapy, when other co-existing problems add to the challenges, including delayed cognition and/or receptive language, poor attention or behavior, and other significant speech diagnoses such as dysarthria (muscle weakness & low muscle tone). Additionally, children with CAS who are in poor health and not able to take full advantage of the learning and practice opportunities available to them, may demonstrate very slow progress in gaining speech production skills.
With appropriate goals and intervention, parents of children with apraxia as the primary diagnosis should expect progress in their child’s use of intelligible words within a three-month period. (Children with apraxia plus other complex challenges likely will have slower progress.)