The well-known sampling limitation of most longitudinal corpus data can be even more consequential in the study of morphosyntactic variation in child language. An analysis of caregiver input suggests that variable use in overlapping contexts may be hard to find by solely relying on corpus data collected under the sampling procedures that are…

When acquiring the English plural, children correctly produce plural words long before they develop an understanding of morphological structure. When acquiring Sesotho noun prefixes, children are aware of the multiple constraints governing variation from a young age. Both of these cases raise questions about the Shin and Miller (2022) account of…

What role does language play in developing the concept of number? This question is at the center of an important current debate. To try to answer it, one must first consider what is needed to learn number words and their meaning. First, the learner has to be able to identify number words as such, that is, to distinguish them from other sorts of…