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Who is most likely to have multiples?

The following factors can increase the chances that a woman will conceive multiples:

  • Fertility treatment
  • Age over 30 years
  • A personal or family history of fraternal (non-identical) twins
  • Obesity or taller-than-average height (2, 5)
  • African-American race (African-American women are more likely to have fraternal twins than caucasian women, and Asian women are the least likely to have fraternal twins) (5)

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