Childhood Apraxia of Speech (CAS): Signs, Diagnosis, and Treatment
Childhood apraxia of speech (CAS) is a neurological speech sound disorder: the child knows what to say, but the brain struggles to plan the movements. Signs include inconsistent errors on the same word, choppy transitions, and wrong syllable stress. It affects about 1 in 1,000 children and needs specialized therapy.
What childhood apraxia of speech is
ASHA’s technical report defines CAS as a neurological childhood speech sound disorder in which the precision and consistency of the movements underlying speech are impaired in the absence of neuromuscular deficits such as abnormal reflexes or tone. The core impairment is in planning and programming the spatiotemporal parameters of movement sequences — the brain’s instructions for which movements to make, in what order, with what timing.2
ASHA’s consumer page explains it for families: a child with CAS knows what they want to say, but has difficulty saying it clearly because the messages from the brain to the mouth get jumbled. NIDCD adds that people with apraxia of speech have trouble saying what they want to say correctly and consistently.3,4
The three core signs
There is no single test for CAS. ASHA’s technical report found no validated list of diagnostic features, but named three that have gained some consensus among researchers.2
| Feature | What it can sound like |
|---|---|
| Inconsistent errors on consonants and vowels | The same word comes out differently on repeated tries |
| Lengthened, disrupted transitions between sounds and syllables | Choppy or effortful movement from one sound to the next |
| Inappropriate prosody, especially stress | Stress on the wrong syllable or word |
Three features of CAS with research consensus (ASHA Technical Report, 2007).2
ASHA’s consumer page adds that if a child speaks more than one language, signs will show up in all of them. Vowel errors are also among the features ASHA describes; in typically developing children, vowel errors become rare after age 3 — 0–4% in one study of 314 American children.3,1,8
CAS vs. a phonological delay
Many children with speech errors are simply following common developmental patterns — fronting, stopping, gliding — on a delayed timetable. Those errors are usually consistent: the same simplification each time. ASHA lists its common patterns with typical ages of elimination; CAS features such as inconsistency and stress errors are not on that list.9
| More typical of a phonological delay | Associated with CAS |
|---|---|
| Same error each time (“tat” for “cat” every time) | Different errors on repeated tries of the same word |
| Errors follow recognizable patterns | Groping, effortful, or choppy transitions |
| Normal rhythm and stress | Stress on the wrong syllable |
| Vowels mostly accurate after 3 | Vowel distortions or substitutions |
CAS can also overlap with dysarthria and co-occur with phonological and language disorders, which is why ASHA emphasizes differential diagnosis, often using dynamic assessment — the SLP provides cues to see how a child’s production changes.1
How common it is
ASHA reports that among children aged 4 to 8 with a speech delay of unknown cause, the estimated prevalence of CAS is about 2.4%. In other words, most children with unclear speech do not have apraxia.1
Treatment
CAS is treated with motor-based approaches built on principles of motor learning — how practice is organized and how feedback is given. ASHA lists Dynamic Temporal and Tactile Cueing (DTTC), the Nuffield Dyspraxia Programme, and Rapid Syllable Transition Treatment among evidence-based motor programming approaches, typically with frequent and intensive practice.1,7
In DTTC, which ASHA describes as an integral-stimulation approach — “look, listen, do what I do” — the clinician constantly adds or fades auditory, visual, and tactile cues after each attempt. A 2020 tutorial sets out its rationale and procedures, and the authors of a randomized trial protocol note that some of the best evidence in the CAS literature supports DTTC.1,5,6
NIDCD states that frequent, intensive, one-on-one therapy is needed for children with apraxia of speech, that no single approach has been proven most effective, and that children will not outgrow it on their own. When speech is not yet enough, ASHA notes that augmentative and alternative communication (AAC) can support communication alongside speech.4,1
An honest note about SpeechStep
SpeechStep is home practice for common speech sound errors. It is not designed or validated for childhood apraxia of speech, and it is not a substitute for treatment by an SLP trained in motor speech disorders.
If you suspect CAS
ASHA notes that SLPs who diagnose and treat CAS should have specialized training in motor speech disorders and motor learning. Ask any SLP you contact about their experience with CAS. ASHA’s consumer page advises talking to your child’s doctor and seeing an SLP if you notice the signs; ASHA ProFind lists certified SLPs.1,3,10
Free Speech Delay Quiz
A 20-question screener that returns a clear risk score and next steps.
Frequently asked questions
What is childhood apraxia of speech?＋
ASHA defines CAS as a neurological childhood speech sound disorder in which the precision and consistency of movements underlying speech are impaired, without weakness or abnormal muscle tone. The core problem is in planning and programming the movement sequences for speech. ASHA’s consumer page puts it simply: the child knows what they want to say, but the messages from the brain to the mouth get jumbled.
What are the main signs of CAS?＋
ASHA’s 2007 technical report names three features with some consensus: inconsistent errors on consonants and vowels in repeated productions of the same syllables or words; lengthened and disrupted transitions between sounds and syllables; and inappropriate prosody, especially stress on the wrong syllable or word. No single sign diagnoses CAS.
How common is childhood apraxia of speech?＋
Rare. ASHA reports a population estimate of about 1 in 1,000 children aged 4 to 8, and about 2.4% among children of that age with a speech delay of unknown cause.
Do children outgrow apraxia?＋
Not without support. ASHA says children don’t usually outgrow CAS without help and usually need treatment to make progress, and NIDCD states that children with apraxia of speech will not outgrow it on their own and that frequent, intensive, one-on-one therapy is needed.
Can an app treat childhood apraxia of speech?＋
No app replaces CAS treatment. ASHA notes that SLPs who treat CAS need specialized training in motor speech disorders and motor learning. SpeechStep is home practice for common sound errors; it is not designed or validated for CAS.
Put this into practice today
Try the free speech delay quiz, or start daily AI speech practice — every child takes one SpeechStep at a time.
References
10 sources from authoritative bodies. Last reviewed October 2026.
- 1.ASHAChildhood Apraxia of Speech — Practice Portal page.
- 2.ASHAChildhood Apraxia of Speech (ASHA Technical Report, 2007) — Technical report, 2007.
- 3.ASHAChildhood Apraxia of Speech — Consumer page.
- 4.NIDCDApraxia of Speech — Fact sheet.
- 5.Peer-reviewedStrand — Dynamic Temporal and Tactile Cueing: A Treatment Strategy for Childhood Apraxia of Speech — Clinical tutorial (AJSLP), 2020.
- 6.Peer-reviewedIuzzini-Seigel et al. — Dose Frequency Randomized Controlled Trial for DTTC Treatment for Childhood Apraxia of Speech: Protocol — Randomized trial protocol (BMC Pediatrics), 2023.
- 7.Peer-reviewedMaas et al. — Principles of Motor Learning in Treatment of Motor Speech Disorders — Tutorial/review (AJSLP), 2008.
- 8.Peer-reviewedPollock & Berni — Incidence of Non-Rhotic Vowel Errors in Children: Data From the Memphis Vowel Project — Clinical study (Clinical Linguistics & Phonetics), 2003.
- 9.ASHASelected Phonological Patterns — Practice Portal page.
- 10.ASHAASHA ProFind: Find a Certified Speech-Language Pathologist — Referral directory.