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Speech development is the process that begins at birth and continues through adolescence when children learn to use sounds and words to communicate meaning and develop the prerequisite skills to early literacy. Children reach milestones in speech development in predictable stages typically by 6 years of age with variations in the rate they acquire speech sounds and speak their first words. Normal human speech is produced with air pressure from the lungs that causes phonation within the larynx, or “voice box,” that is subsequently modified within the vocal tract through the coordination of muscle action of the tongue, jaw, and lips to produce the different vowels and consonants that make up language.

Phases and Sequence of Speech Sound Acquisition

Ken Bleile identified four phases of speech sound ...

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