Researchers Helle et al., 2004) analyzed rates of twin births in the Sami population of Northern Scandinavia during the eighteenth and nineteenth centuries. They found that 1) a baby born from a singleton pregnancy was more likely to survive to adulthood than a baby born from a twin pregnancy, and 2) the average number of offspring raised to adulthood was higher for women who had twins than for those who never had twins. These data suggest that in this population, human twinning rate was

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The data suggest that women who had twins raised more offspring to adulthood, indicating a potential advantage for twinning. This suggests directional selection favoring twinning, as it increases reproductive success.

Researchers Helle Et Al