期刊
JOURNAL OF CHILD LANGUAGE
卷 31, 期 4, 页码 855-873出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0305000904006518
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We explored vocabulary competence in 35 firstborn and secondborn sibling pairs when each child reached 1;8 using multiple measures of maternal report, child speech, and experimenter assessment. Measures from each of the three sources were interrelated. Firstborns' vocabulary competence exceeded secondborns' only in maternal reports, not in child speech or in experimenter assessments. Firstborn girls outperformed boys on all vocabulary competence measures, and secondborn girls outperformed boys on most measures. Vocabulary competence was independent of the gender composition and, generally, of the acre difference in sibling pairs. Vocabulary competence in firstborns and secondborns was only weakly related.
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