BABBLING 3-4 MONTHS
ANATOMICAL CHANGES - TONGUE IN PROPORTION TO MOUTH, VOCAL TRACT, PHARYNX LENGTHENS, LARYNX LOWER
CANONICAL (BA), REPUBLICATED (DADA), VARIEGATED (BADABADA)
PHONEMES ACROSS LANGUAGES, INFANTS BORN WITH ABILITY TO RECEIVE ANY PHONEME (CHOMSKY)