Presents a quantitative study of children's noun plural overregularizations on recent comparisons of connectionist and symbolic models of language. The speech of 10 English-speaking children aged 1;3 to 5;2 were analyzed. Results pose challenges to connectionist models, but are consistent with the blocking-and-retrieval-failure model in which regulars are generated by a default rule while irregulars are retrieved from the lexicon. (JL)