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• n  fertilization of a second ovum after a pregnancy has begun; results in two fetuses of different ages in the uterus at the same time
  superfetation is normal in some animal species

• There have been only 10 recorded cases of superfetation, the phenomenon of a woman getting pregnant twice.
• There have only been 10 recorded cases of the phenomenon, dubbed superfetation.
• There have been only 10 recorded cases of superfetation, the phenomenon of a woman getting pregnant twice.