| The phenomenon, known as superfecundation, usually results in the second baby dying as the older gets better nourished in the womb. |
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| Traditionally, cases of superfecundation have been discovered by the starkly different appearances of twins. |
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| The scientific term describing fraternal twins by different fathers is heteropaternal superfecundation. |
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| Obviously, the twins resulting from superfecundation are dizygotic. |
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| A mother has had two non-twin children on the same day, due to a 1,000,000-1 phenomenon, known as superfecundation, where a woman conceives twice in the same month. |
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| Monopaternal superfecundation is probably much more common because under normal circumstances it is not recognized. |
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| Superfetation is more rare than superfecundation. Only a couple of cases have been described. These superfetation cases were both homopateral. |
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