Speech sound disorders are conditions where a child's articulation or pronunciation is delayed or deviant from normal speech sound development. There are five types of speech sound disorders:
The precise causes for functional speech disorders, developmental phonological disorders and developmental apraxia of speech are unknown.
Developmental dysarthria is caused by impaired nerve and muscle function.
Some conditions such as cleft palate, hearing impairment, certain syndromes, tongue-tie, paediatric stroke will affect a child's clarity of speech.
A child with a speech disorder may have one or more of these signs and symptoms:
Omissions or deletionsDefinition: Certain sounds are not produced but omitted or deleted.Examples: "boo" for "book" and "soon" for "spoon"
SubstitutionsDefinition: One or more sounds are replaced with a different sound.Examples: "bat" for "pat", "dood" for "good" and "wabbit" for "rabbit"
AdditionsDefinition: One or more sounds are added or inserted into a word.Examples: "buhlack" for "black" or "doguh" for "dog"
DistortionsDefiniton: Sounds are altered or changed.Examples: An interdental "s" whereby the "s" sound is being produced with the tongue sticking out in between teeth
Syllable-level errorsDefinition: A syllable is repeated or deleted.Examples: "dada" for "dad" or "te_phone" for "telephone"
Prosody errorsDefinition: Inappropriate use of stress, intensity, rhythm, and intonation during speech
An assessment by a speech therapist is necessary to determine the type of speech disorder(s) a child with unclear speech has. Other medical or allied health professionals may also need to be involved in the assessment and management.
Children typically learn to produce different speech sounds gradually. Below is a general guide of speech sound development (consonant sounds):