A baby girl weighing 15 pounds at birth was born in India on Monday, and doctors say she could be the heaviest ever born in the country, if not in world history.

The baby's 19-year-old mother, Nandini, gave birth to her first child in southern India via Caesarean section.

According to BBC, local doctors said the baby weighs the same as a six-month-old infant, twice the size of the average newborn, which typically weighs an average of 7.5 pounds.

The baby is also very tall, measuring 24.4 inches, while most babies in India measure only around 20 inches.

"In my 25 years of experience, I had never seen such a big baby," Dr. Venkatesh Raju, district health official, said in a report in the Daily Mail.

"She is a miracle. I believe she is not only the heaviest baby born in India but the heaviest baby girl ever born," Raju added.

Nandini, who weighs 94 kilograms and stands 5'9, had a smooth pregnancy, but was not aware that the baby will be born big.

Doctors are uncertain about the reason behind the baby's size as her mother did not have diabetes, thyroid problems or other abnormalities. Doctors also considered the possibility that the baby may have high sugar levels, which causes obesity in newborns.

The baby was found to be in good health, doctors said.

According to Dr. Poorima Manu, the gynecologist who delivered the baby, the surgery was done for almost half an hour and was free of any risks.

The baby is being kept in the neonatal intensive care unit and is under constant monitoring before being discharged.

According to USA Today, doctors are currently doing tests for "inborn error of metabolism," which is a kind of disorder where the body is having difficulty breaking down food.

The Guinness record for the heaviest newborn belonged to a baby born in Canada in 1879, who weighed 23 lbs 12 oz. But the baby, whose mother had giantism, died 11 hours after birth.

The record holder for the world's heaviest baby was a healthy baby boy born in September 1955 in Aversa, Italy, and weighed 22 lbs. 8 oz. or 10.2 kg.