DefinitionPhonological disorder is a type of speech disorder known as an articulation disorder.Children with phonological disorder do not use some or all of the speech sounds expected for their age group.Alternative NamesArticulation disorder; Developmental articulation disorder; Speech distortion; Sound distortionCauses, incidence, and risk factorsThis disorder is more common in boys. About 3% of preschool children and 2% of children ages 6 - 7 have the disorder.The cause of phonological disorder in children is often unknown. Close relatives may have had speech and language problems. Other risk factors may include poverty and coming from a large family.Phonologic disorders may also be caused by:Problems or changes in the structure or shape of the muscles and bones that are used to make sp