The gradual expansion in complexity and meaning of symbols and sounds as perceived and interpreted by the individual through a maturational and learning process. Stages in development include babbling, cooing, word imitation with cognition, and use of short sentences.
    

concept

A small child attempts to ask a pharmacist for some ipecacuanha, but only succeeds in babbling excrementally. Colour photomechanical reproduction of a lithograph, c. 1900.

Language is art / written by Shyronn Jones & Shyloh Jones.

Normal language development : the key to diagnosis and therapy for language-disordered children / Carla Ross Trantham, Joan K. Pedersen.

Communication and the disadvantaged child / edited by William G. Hardy ; illustrated by Aaron Sopher.

The development and disorders of speech in childhood / Muriel E. Morley ; foreword by S.D.M. Court.

Speech genes.

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Language is art / written by Shyronn Jones & Shyloh Jones.

Normal language development : the key to diagnosis and therapy for language-disordered children / Carla Ross Trantham, Joan K. Pedersen.

Communication and the disadvantaged child / edited by William G. Hardy ; illustrated by Aaron Sopher.

The development and disorders of speech in childhood / Muriel E. Morley ; foreword by S.D.M. Court.

Speech genes.