Beijing (CNN) A 67-year-old retired doctor has given birth in China -- potentially making her the country's oldest new mother.

The woman, surnamed Tian, gave birth to a girl on Friday at Zaozhuang Maternity and Child Health Hospital, where she had worked as a doctor before retiring, in the country's northeastern Shandong province.

A hospital spokeswoman told CNN that Tian fell pregnant naturally after using her medical knowledge to self-administer traditional Chinese fertility treatments.

The baby was delivered via a cesarean section. "We were quite lucky, given that the mother was at an advanced maternal age and had a variety of complications," Liu Wencheng, the physician in charge of the delivery, told state-run broadcaster CCTV . The baby reportedly weighed 2.56 kilograms (5.6 pounds) at birth.

Liu said that "during the cesarean section, we found that Tian's ovaries were just like the ones of a 40-year-old woman. They hadn't shrunk like a 60-year-old's ovaries would have, which might explain how she got pregnant naturally."

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