A Phonological Disorder involves a pattern of speech sound errors. For example, if a child consistently substitutes the “t” sound for the “k” sound, this is the phonological process of “fronting.” Speech sound errors are very common in young children; however, if an error persists after the expected age of extinction, he or she may have a phonological disorder.
Expected ages at which 10 common phonological processes are extinguished in children:
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