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The association between the number of preschool children in a family and rates of family breakdown was studied in a birth cohort of New Zealand children during the period from birth to ten years. The analysis showed that with increasing levels of exposure to preschool children the risk of family breakdown decreased significantly....The findings are consistent with previous research which suggests that the presence of preschool children in the family acts as a protective factor that reduces risks of family breakdown. (EXCERPT)
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Fergusson et al. (1990) studied this question.
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