A longitudinal study of the phonological development of two Cantonese-English bilingual children

Longitudinal case studies of the successive phonological acquisition of two Cantonese-English bilingual children, aged 2;3 to 3;1 years and 2;9 to 3;5 years, are presented. The children were assessed at 4-week intervals. The first assessment of their phonology occurred when they had been exposed to English for three months. Phoneme acquisition and phonological process data revealed that both children had separate phonological systems for the two languages. The two phonological systems for each child developed in similar ways to monolingual children acquiring Cantonese and English. However, a n umber of error patterns, indicative of disorder in monolingual children, we re evident in the children's phonological systems in English and in Cantone se. These patterns have been documented as normal error patterns for succes sive bilingual Cantonese-English speaking children. The difference between normal successive bilingual phonological development and normal monolingual development is addressed.