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Dunstan Baby Language is a theory about infantile vocal reflexes as signals, in humans. The theory is that across cultures and linguistic groups there are five sounds, each with a meaning, that are used by infants before the language acquisition period. The hypothesis was developed by Australian former mezzo-soprano, Priscilla Dunstan, and has been featured on The Oprah Winfrey Show.[1] Dunstan's theory has not been scientifically validated.