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Phonological disorder is a failure to use speech sounds appropriate for the individual's age and dialect.
This disorder is more common in boys. Approximately 3% of preschool children and 2% of children aged 6 - 7 have the disorder. By age 17, only 0.5% are affected.
The cause of phonological disorder in children is unknown. There may be a genetic component, since a large proportion of children with this problem have relatives with a similar disorder. Other risk factors seem to be low socioeconomic status and coming from a large family.