A Florida woman with a double uterus managed a 1-in-5-million feat, according to her doctor: She gave birth to twins -- one from each uterus.
Andreea Barbosa, 24, gave birth to Nathan and Natalie last week. She and her husband conceived the twins without reproductive medicine or extra effort, according to the St. Petersburg Times.
Roughly one in 2,000 women has what's called uterus didelphys, said Barbosa's obstetrician, Dr. Patricia St. John. It happens when the two small tubes that join to form the uterus end up growing into separate structures, according to the Mayo Clinic.
Such a birth as Barbosa experienced had a 1-in-5-million chance of occurring, St. John said.
"A woman would have to release two eggs at once and both would have to be fertilized and implanted successfully in separate uteruses. Then both had to develop into viable pregnancies," she said.