Speech MilestonesPhonological patterns disappearing by: 3 years: unstressed syllable deletion, final consonant deletion, diminutization, velar fronting, consonant assimilation, reduplication, prevocalic voicing 4 years: fronting of initial velar singles, deaffrication, cluster reduction w/o “s” 5 years: depalatalization of final singles, depalatalization of initial singles, alveolarization, final consonant devoicing, cluster reduction with “s” 6 years: initial voicing 7 years: gliding of initial liquids 8 years: epenthesis Intelligibility levels: 19-24 months: 25%-50% 2-3 years: 50%-75% 4-5 years: 75%-90% 5+ years: 90%-100% |