In a world first, a baby has been born with DNA from three biological parents. Five-month-old Abrahim Hassan’s Jordanian parents, Ibtisam Shaban and Mahmoud Hassan, were treated by a U.S. team based in Mexico using a controversial technique that allows parents with rare genetic mutations to have healthy babies, the New Scientist reports. Shaban carries genes for Leigh syndrome, a rare genetic disorder characterized by the degeneration of the central nervous system; the brain, spinal cord, and optic nerve.