Childhood Apraxia of Speech vs. an Articulation Disorder: How Parents Can Tell the Difference

Apraxia of speech in children and an articulation disorder can both affect how clearly a child speaks. Still, they are not the same problem. Childhood apraxia affects how the brain plans speech movements.

An articulation disorder affects how certain sounds are made. A speech-language pathologist, or SLP, looks at the full speech pattern to tell them apart.

The difference matters because the two conditions call for different therapy, and because they are nowhere near equally common. The American Speech-Language-Hearing Association (ASHA) puts childhood apraxia of speech at roughly 1 in 1,000 children aged 4 to 8, while studies of speech sound disorders in general have found rates ranging from 2.1% to 23% of 4- to 6-year-olds. Most children with unclear speech do not have apraxia.

What Is Apraxia of Speech?

Parents often ask, “What is apraxia of speech?” Childhood apraxia of speech, or CAS, is a motor speech disorder. The brain has trouble planning the movements needed to say words clearly.

The issue is not weak lips, tongue, or jaw muscles. Instead, the child has trouble organizing the movement sequence needed for speech. ASHA defines CAS as a disorder “in which the precision and consistency of movements underlying speech are impaired in the absence of neuromuscular deficits.”

The American Speech-Language-Hearing Association, or ASHA, points to several common features of CAS. These include changing speech errors, trouble moving smoothly between sounds, and unusual word stress.

Stated more precisely, the three features that have gained the most agreement among researchers are inconsistent errors on consonants and vowels when the same syllable or word is repeated, lengthened, and disrupted transitions between sounds and syllables, and inappropriate prosody, especially in how lexical or phrasal stress is produced.

ASHA is explicit on this, noting that these features “are not proposed to be the necessary and sufficient signs of CAS.”

ASHA describes CAS as arising in three ways: idiopathic, meaning no cause is found, which is the largest group; following a known neurological event such as a stroke or brain injury; or as part of a complex neurodevelopmental condition, including Down syndrome and 22q11.2 deletion syndrome.

It is also worth saying what does not cause CAS. Apraxia Kids notes that it is not brought on by daycare, a house move, or anything a parent did or did not do, and raising a child with two languages does not cause it either.

One sign alone is not enough to diagnose CAS. An SLP must look at several speech patterns together.

What Is an Articulation Disorder?

An articulation disorder happens when a child has trouble making certain speech sounds correctly.

For example, a child may:

• Replace one sound with another, such as saying “wabbit” for “rabbit”
• Leave out a sound, such as saying “cu” for “cup”
• Add a sound, inserting an extra sound into a word
• Distort how a sound is produced

These errors are often more predictable than the errors seen in CAS. A child might make the same mistake each time a certain sound appears.

Age matters when judging whether an error is a problem at all. Reviews by McLeod and Crowe found that most English consonants are in place by around age 5, with the two “th” sounds among the last, typically at ages 5 to 6. A four-year-old who says “wabbit” may be within the expected range. The same error at age eight is not.

An articulation disorder is also different from a phonological disorder. Phonological problems affect broader sound patterns rather than just one sound.

Speech difficulties also rarely travel alone. ASHA reports that roughly 40% of children with speech sound disorders also have a language impairment, and that about 3.6% of children still have a speech sound disorder at age 8.

Apraxia of Speech in Children vs. an Articulation Disorder

The differences are often easier to see when speech patterns are compared side by side.

A child who says the same word differently each time may have CAS. However, inconsistency can also appear with some phonological disorders.

ASHA lists inconsistent whole word productions as one error type seen across speech sound disorders generally, not as proof of apraxia.

That is why speech patterns should be evaluated by an SLP rather than judged from one symptom.

Early Signs of Childhood Apraxia of Speech

The early signs of childhood apraxia of speech usually appear as a group.

Parents may notice:

• The same word sounds different across several attempts.
• Longer words are much harder than shorter ones.
• Speech sounds choppy or broken.
• Stress falls on the wrong part of a word.
• Moving from one sound to another seems difficult.
• The child appears to search for the right mouth position.

Younger children may also use fewer consonant sounds or simple syllable shapes.

ASHA points to a small consonant inventory and delayed consonant development as early markers. Apraxia Kids adds that many of these children were quiet babies who babbled little, and that their understanding of language often runs ahead of what they can say.

These signs do not confirm CAS. There are reasons to ask an SLP for a closer look. Under age three, ASHA notes clinicians may use a provisional description such as “CAS cannot be ruled out” while treating the child as though it is present.

How an SLP Tells the Difference

An evaluation looks at more than the sounds a child gets wrong.

The SLP may review the child’s speech history, language skills, hearing, and oral movements. The clinician may also listen to single words, longer words, repeated words, and conversation.

The oral mechanism examination matters for a specific reason: it helps separate CAS from dysarthria, a motor speech disorder caused by muscle weakness or altered tone, which tends to produce more consistent errors and no groping. The two can also occur together.

When CAS is suspected, the SLP pays close attention to:

• How consistent are the errors
• How sounds connect
• Speech rhythm and stress
• Word length
• How speech changes with cues

The SLP may also use dynamic assessment. This means giving different types of help and watching how the child’s speech responds.

There is no single test that proves a child has CAS. The diagnosis comes from the pattern seen across several tasks.

How Treatment Differs

Treatment depends on what is causing the speech difficulty.

For CAS, therapy often focuses on practicing speech movements again and again. The child works on coordinating sounds and syllables into smooth movement patterns.

ASHA describes motor-based approaches such as Dynamic Temporal and Tactile Cueing, or DTTC, and Rapid Syllable Transition Treatment, or ReST.

DTTC works on a “look, listen, do what I do” model, with cues added and then faded as the child moves toward saying the word alone. It suits younger children and more severe presentations. ReST uses multisyllabic invented words to train flexible movement sequences and stress control, and suits older children with milder difficulty.

Articulation therapy has a different focus. The child learns how to make a target sound correctly and use it in more places.

Practice may start with a sound or syllable. It can then move into words, sentences, and everyday conversation. For broader phonological patterns, clinicians may use minimal pairs or the cycles approach instead.

Some children have more than one speech or language need. Their therapy plan may address articulation, language, phonological skills, or literacy at the same time.

Literacy deserves particular attention with CAS. ASHA describes early and persistent problems in speech, expressive language, and the phonological foundations of literacy, which is why reading and spelling are often built into the plan early.

AAC can also help when speech is difficult to understand. It gives the child another way to communicate while speech skills continue to grow.

This can be as simple as gestures or as structured as a speech-generating device, and ASHA notes it can support language growth that a child cannot yet practice out loud.

When to Get an Evaluation

Parents do not need to wait for speech problems to become severe.

Consider an evaluation of:

• Family members or classmates often have trouble understanding your child.
• Speech errors change a lot from one attempt to another.
• Longer words are much harder to say
• Your child struggles to move smoothly between sounds.
• Speaking causes frequent frustration.
• Progress has slowed or stopped.

Children can sometimes begin treatment even when the SLP is still working toward a final CAS diagnosis.

Early support gives the clinician more chances to watch how speech changes over time.

What is the main difference between apraxia and an articulation disorder?

CAS affects the planning of speech movements. An articulation disorder affects the production of certain sounds. An SLP looks at the pattern of errors to find the cause.

Why does my child say a word correctly once and incorrectly the next time?

Changing errors can occur with CAS. They can also happen with some phonological disorders. An SLP looks at consistency, stress, transitions, and other speech features together.

Is childhood apraxia caused by weak mouth muscles?

No. CAS is not caused by weak tongue, lip, or jaw muscles. The difficulty involves planning and coordinating speech movements.

Can a child have CAS and another speech disorder?

Yes. A child with CAS may also have phonological, articulation, or language difficulties. An evaluation helps determine which areas need treatment.

How do speech-language pathologists test for apraxia?

SLPs listen to speech across several tasks. They may use single words, repeated words, longer phrases, and conversation. They also watch how the child responds to different types of cues.

Does learning two languages cause childhood apraxia?

No. Learning more than one language does not cause CAS. An SLP should consider all the languages a child uses when evaluating speech.

Apraxia of speech in children and an articulation disorder may sound similar at first. The reasons behind the speech errors are different. A detailed evaluation can show which speech patterns are present and what type of therapy may help.

If you have concerns about your child’s speech, book a pediatric speech therapy evaluation with Precision Speech Therapy in Forney, Texas. A clear assessment can help you understand what your child needs next.