Investigating the Dynamics in 18-36 Months Toddlers’ Vocabulary Acquisition

Objectives: The purpose of this study was to determine whether there were changes in language ability and vocabulary usage children aged 18 36 months by specific time points. Methods: A total 1,152 Korean children’s Wordbank data based on the MacArthur-Bates communication development assessment (K M-B CDI) used for analysis. is divided into two sections according collection, one collected before 2003, other between 2016-2017. Data from 2-time points point 1 group (n = 988), 2 (n= 164). score category K CDI compared In addition, significance differences each item performing differential functioning analysis classical test theory response theory. Results: This found that difference not significant. However, scores be significant 7 24 categories, significantly higher than 6 categories. 117 items out a 641 analyzed have function. Conclusion: Given showed performance categories function words, it can inferred skills may appear over time, results also confirmed dynamics early use patterns.