Hanoi police have found an infant who was kidnapped at the Hanoi-based National Hospital of Obstetrics and Gynecology last week.
The child was kidnapped November 3 and found on Tuesday.
According to Nguyen Duc Chung, vice director of the Hanoi police division, officers have also taken Nguyen Thi Le, 29, the kidnapping suspect, into custody for interrogation.
Le claimed that she kidnapped Pham Xuan Truong, who was born on November 1, because she wanted to adopt him after her baby died during her delivery, Tuoi Tre reported Wednesday.
She said on November 3, she entered the hospital and took a doctor's shirt hanging outside and entered the room where Truong's mother, 34-year-old Tran Thi Thom, was staying, the newspaper said.
Le then told the mother that she would take the baby for some tests, but she fled the hospital with the baby instead.
She took a taxi to her mother's home in the northern province of Bac Giang before bringing the baby back to her husband's home in Dong Anh District, Hanoi, several days later, according to Tuoi Tre.
The Tuoi Tre report said Hanoi police found Le and the baby following information provided by the taxi driver, whose identity wasn't revealed.
Pham Xuan Chieu, the father, quoted doctors as saying that baby was in good health and had been cared for properly during the kidnapping.
Police said further investigations into the case are now underway.
Chung also said that while the baby was identified as Truong based on traits provided by his family, DNA tests would be conducted if the family so requests.
Lawyer Cao Ba Trung, a representative of Thom's family, had previously asked to press charges against health workers who allowed the stranger to enter the hospital during non-visiting hours.
But he then said the charges would be dropped if the baby was found.
Under Vietnam's criminal code, kidnapping carries a sentence of imprisonment of between three years and ten years.