Dynamic analyses of language growth tell us how vocabulary and grammar develop and how the two might be intertwined. Analyses of growth curves between 17 and 42 months, based on longitudinal data for 34 children, revealed interesting patterns of vocabulary and grammatical developments. They showed that these patterns were nonlinear, but with…

This longitudinal, ethological study explores the development of communication behaviors, different types of social peer interactions, and mother-child interaction among 15 boys and 15 girls from 16 through 30 months of age. Each subject was filmed twice each month over a period of 14 months while he or she had lunch with 5 peers. Several subjects…