The aim of this article is twofold. First, the usefulness of the midparent-midtwin design as a proxy for a longitudinal study was assessed. This design should prove effective in determining which of a nmber of infant measures are predictive of later IQ and thus are likely candidates for infant intelligence measures. Second, a true longitudinal study was conducted to examine the predictability of our infants measures in chidhood. Intelligence measures of the twins at ages 1, 2, and 3 years were collected. In this way, we could determine whether the infant variables that predicted midparent IQ help us as predictors of infants' IQ scores.
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DiLalla et al. (1990) studied this question.
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