This article looks into why infants learn to talk, using a series of illustrative proposals as to the short- and long-term consequences to the infant behaviors that lead to linguistic competence. The goal of the article is to encourage investigation of behavioral dispositions that nudge the child toward proficiency in the use of the spoken…

A validation study of five checklists for assessing two-year-olds' word production revealed that the lists produced comparable mean production scores, reflected age differences, and preserved individual differences in total production and in production of linguistic categories such as nouns, verbs, open class items, and closed class items.…