How does linguistic structure affect children's developing cardinal number knowledge? The bootstrapping theory proposes that children might use syntactic information provided by known words such as quantifiers to bootstrap the meanings of unfamiliar words such as number words. Prior studies of numeral and quantifier development have indicated that the bootstrapping mechanism that children can use to discover numeral meanings might work differently in different languages. Nevertheless, support for this conclusion remains preliminary. The present study explored this hypothesis through an investigation of the possible relations between cardinal number knowledge and quantifier comprehension in Mandarin Chinese-speaking children. Notably, in contrast with previous studies, this study also offered a glimpse into children's receptive vocabulary development and its relation with cardinal number knowledge and quantifier comprehension. Results showed that cardinal number knowledge did not seem to be correlated with quantifier comprehension (both "exact" and "non-exact" quantifiers) when controlling for such covariates as children's age, gender, parent education, and family income. Moreover, children's receptive vocabulary size explained a significant amount of variance in their quantifier knowledge over and above children's age, gender, parent education, and family income, but not in their cardinal number development over and above these covariates. These results provide further evidence for the hypothesis that while the bootstrapping mechanism may facilitate number word learning in children speaking languages like English, it might play a lesser role in children speaking classifier languages such as Mandarin Chinese. Implications for the role that general receptive vocabulary plays in the acquisition of number words and quantifiers are also discussed.