The American Speech-Language-Hearing Association guidelines describe a language disorder as impaired comprehension or use of spoken, written, or other symbol systems. A language disorder may involve the form of language (phonology, morphology, syntax), the content of language (semantics), and the function of language in communication (pragmatics) in any combination. Prelinguistic communication behaviors (eg, gestures, babbling, joint attention) are associated with language delays and should be assessed in very young children.