Her name was Lina Medina, a Peruvian girl from the Andean village of Ticrapo… Lina’s parents initially thought their daughter had a large abdominal tumor… but Lina was eventually transferred to a hospital in Lima, where she delivered a six-pound baby boy by Cesarean section on 14 May 1939. Lina’s father was temporarily jailed on suspicion of incest, but he was released for a lack of evidence and authorities were never ableto determine who fathered Lina’s child.

By the way, the answers are here: her doctors were stunned as she had been having regular periods since the age of three. According ot her doctor, Escomel, she had an extraordinary hormonal disorder of the pituitary gland.