Data are presented from one subject (J) that show a gradual development of the complexity of words in terms of syllable structure and degree of phonetic similarity of co-occurring consonants. During the age range of 1;9 to 2;6, J's data show a highly systematic progression of stages, each characterized by fewer restrictions on the number, order,…

Sound play is important to child language development in that it contributes to the phonetic substrate, it is a factor in phonological development, and it is something to be learned as part of the socially acceptable use of language. Sound play progresses in three stages: (1) babbling, in which a gradual acquisition of phonetic units is built up…

This paper reports on a longitudinal study of the acquisition of the voicing contrast in English word-initial stop consonants, as measured by voice onset time. Four monolingual children were recorded at two week intervals, beginning when the children were about 1;6. Data provided evidence for three general stages: (1) the child has no contrast;…

This paper reports on a longitudinal study of the acquisition of the voicing contrast in American-English work-initial stop consonants, as revealed through instrumental analysis of voice onset time characteristics. Four monolingual children were recorded at approximately two week intervals, beginning when the children were about 1;6. Data provide…

The data in this study are taken from an on-going research project investigating the development of the production of intervocalic consonants in Mexican Spanish. The total project includes both longitudinal and cross-sectional studies of forty children and uses both naturalistic observation and experimental methods. The data discussed here is from…

The acquisition of the consonant system by a child acquiring Mexican-Spanish as her native language is described. During the earliest stages (from 1;7 to 2;1 years of age), the data showed several phenomena that could best be accounted for by assuming a central role for the word as the basic unit being acquired. The evidence for the centrality of…