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The Intellectual Achievement of Only Children

  • Denise F. Polit (a1) and Toni Falbo (a2)

A quantitative review of the literature on the intellectual achievement of only children indicated that only children were never at a disadvantage in relation to any comparison group; nor were they significantly different from first-born children or children from two-child families. Moreover, only children were at a significant advantage in comparison with later-born children and those from large families. The consistency of these findings across subgroups suggests that interpersonal mechanisms are largely responsible. The strong only-child advantage on tests of verbal ability, together with the overall pattern of findings, implicates parent–child interactions as responsible for the family size and birth order variations in intellectual achievement.

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Journal of Biosocial Science
  • ISSN: 0021-9320
  • EISSN: 1469-7599
  • URL: /core/journals/journal-of-biosocial-science
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