(CNN) A 20-year-old Bangladeshi woman gave birth to twins -- 26 days after giving birth to her first child.

Arifa Sultana gave birth to a boy in late February, according to Dr. Sheila Poddar, a gynecologist at Ad-Din hospital in Dhaka. After a normal delivery, the mother and baby were released from a different Dhaka hospital. Less than four weeks later, she was admitted to Ad-Din hospital.

Fascinating, mysterious, and medically amazing case files. This series is the most interesting education into the world of medicine and disease and the human body.

"She came to the hospital complaining of lower abdominal pain," Poddar said. Doctors performed an ultrasound and realized Sultana was pregnant with twins.

Sultana had two uteruses, a condition called uterus didelphys. Her first baby and the twins were conceived and grown in separate wombs.

She did not get an ultrasound before the first delivery, so it was missed, Poddar said.

Read More