Sep 08, · skikdainfo.info Child Born with Second Penis Fetus in Fetu (FIF) is a rare and very mysterious medical condition that is said to have occurred (or at least is recorded to have occurred) less than ninety times throughout medical history. my son was born with a big penis My son was born with a big penis when born it was 4 inches the pediatrician I'm having my second baby soonish and no. A BABY boy was born with an extra penis on his back believed to be all that was left of his parasitic twin. The little boy has had an operation to successfully remove the extra organ. Doctors believe the second penis was caused by a parasitic twin that failed to develop Doctors believe the second.