superfetation
/ˌsupərfɪˈteɪʃən/
noun
- The occurrence of a second conception during a pregnancy, resulting in two fetuses of different ages in the womb.
- The doctor explained that superfetation happens when a woman ovulates again after already being pregnant.
- Superfetation is extremely rare in humans but has been documented in a few cases.
- Some animals, like kangaroos, can experience superfetation as a normal part of reproduction.