Early child phonology was studied using phonetically transcribed samples that six parents provided of their children's vocalizations, beginning when the children were about 11 months old and continuing to four years of age. The primary study objective was to obtain a sufficient amount of longitudinal data from several children to support a detailed charting of early phonological development. Over 30,000 utterances have been collected and tabulated. Analyses are provided on onset and acquisition of multiple-word utterances, acquisition of phonological features, metathesis, and anomalous sound changes. Computer-assisted data analysis was undertaken, and the stored linguistic information incorporates details on initial and final consonants and consonant clusters, tags marking each utterance for reduplication, assimilation, metathesis, intervocalic consonants, "strange" vowels, and phrase context. Two phonological studies were conducted from this computerized data to investigate how one child acquired /stop + liquid/ clusters in initial word position. These studies seek to clarify the interaction between how often a sound is used in spontaneous speech and how it is phonetically realized. The preliminary studies suggest that during the overall acquisition process, each initial consonant and consonant cluster individually moves from one acquisition stage to the next. They may or may not be synchronized and occur either within or between natural consonant classes. (SW)