title: Vocabulary competence in first- and secondborn siblings of the same chronological age.
abstract: We explored vocabulary competence in 55 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 age difference in sibling pairs. Vocabulary competence in firstborns and secondborns was only weakly related.
authors.affiliation: Child and Family Research, National Institute of Child Health and Human Development, National Institutes of Health, Department of Health and Human Services, Bethesda, MD 20892-7971, USA. Marc_H_Bornstein@nih.gov
authors.forename: Marc H
authors.initials: MH
authors.lastname: Bornstein
authors.forename: Diane B
authors.initials: DB
authors.lastname: Leach
authors.forename: O Maurice
authors.initials: OM
authors.lastname: Haynes
mesh_terms: D001722:Birth Order; D002663:Child Language; D005260:Female; D006801:Humans; D007223:Infant; D007600:Judgment; D007804:Language Development; D008297:Male; D009035:Mothers / Q000523:psychology; D012737:Sex Factors; D035781:Siblings / Q000523:psychology*; D014825:Vocabulary