Strictly speaking no, it is not necessary, CDS is not universal among world cultures and as such plenty of children learn to speak with a lack of CDS.
It's only required that you speak to the child, not necessarily use CDS patterns.
nativist view.
caretaker speech tends to be slower speech with short ,simple words and sentences which are said in a higher-pitched voice with exaggerated inflections and many repetitions of essential information.
Anne Dunlea has written: 'Vision and the Emergence of Meaning' -- subject(s): Blind Children, Language, Language acquisition, Speech acts (Linguistics)
Duncan Markham has written: 'Phonetic imitation, accent, and the learner' -- subject(s): Second language acquisition, Speech perception
Werner F. Leopold has written: 'Speech development of a bilingual child' -- subject(s): Bilingualism, Language acquisition
Psycholinguistics is the study of how people acquire, produce, and comprehend language. It explores the mental processes involved in language use, such as memory, perception, and problem-solving, to understand how humans understand and produce language.
Peggy J. Miller has written: 'Amy, Wendy, and Beth' -- subject(s): Language acquisition, Speech and social status
King's Speech directed by Tom Hooper.
Speech therapists examine, diagnose and treat patients with speech disorders. Classes they must take include Speech and Language Acquisition Course, Speech Anatomy and Physiology Course, and Speech Therapy and Phonetics Course, to name a few.
Understanding speech in a foreign language is often difficult at first, especially if the speech concerned is not directed specifically at you and if there is background noise, as in a bar, for example. Listening comprehension needs developing through practice.
"He was arrested after making a speech that the government considered to be seditious.""Seditious" means: "speech or behaviour directed against the peace of the state," or conduct or language inciting rebellion against the authority of a state."
The behaviorist view of language acquisition is that children learn language by receiving reinforcement from their parents after speaking correctly (operant conditioning). If a child's parents become ecstatic when the child says "mama", the child will want to continue speaking to get the same positive reaction. If a child gets a sip of milk after saying "milk", the speech is reinforced, and the child learns that it can get what it wants by saying so.