GiorgioMD8 months ago

Superfetation

Superfetation is when a pregnant woman becomes pregnant again. It is characterized by the fertilization and the implantation of a second fertilized egg in a uterus already containing a fetus or zygote. With superfetation, the two fetuses have different due dates. Superfetation can occur in some animals but is so rare in humans that fewer than 10 cases have been reported in the medical literature