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The early developmental context of twinship: some limitations of the equal environments hypothesis

Ricardo C Ainslie1, Kelly M Olmstead1, Daniel D O'Loughlin1

  • 1University of Texas at Austin.

Using questionnaires distributed to mothers, the characteristics of early development in twinship were investigated. Results indicated twinship to be an at-risk situation with neonatal complications and within-pair differences in the attainment of developmental milestones. The implications of these differences raise questions about the accuracy of the equal environments hypothesis.

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