Many children present unusual difficulty learning and using language, which is often divided into three domains: (1) form, which is related to grammar; (2) content, which concerns vocabulary and meaning; and (3) use, which is related to conventions for social interaction, such as appropriate eye contact and taking turns during conversations. A child’s ability to comprehend or produce language may be affected. When language production is problematic, the child is said to have an expressive language disorder. If both comprehension and production are affected, the child is said to have a mixed receptive and expressive disorder. These difficulties can result from a clear cause, such as a hearing impairment, an intellectual impairment, or a genetic syndrome, or they can be idiopathic, meaning there is no ...

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