A speech disorder is when a person is unable to produce speech sounds correctly or fluently, or has problems with his or her voice. Difficulties pronouncing sounds, or articulation disorders, and stuttering are examples of speech disorders. Speech disorders can exist on their own, or be a part of another disorder, such as Autistic Spectrum Disorder or muscular dystrophy.
The term "speech disorders" can refer to many different types of speech disorders, such as:
(Definitions from the American Speech-Language-Hearing Association (ASHA) )
(Statistics from the National Institute on Deafness and Other Communication Disorders)