The infant weighs the same as a six-month-old in a country where new-born babies normally weigh 2.5-3.5kg.
Her mother Nandini, 20, gave birth by a Caesarean section, at a hospital in the southern state of Karnataka.
"It is the biggest baby in India, I can say. Whether it is the biggest in the world, I cannot say right now," said District Health official in Hassan district Dr Venkatesh R.
Doctors are trying to ascertain why the baby was abnormally heavy through different kinds of tests.
Photographers capture joys of childbirth
Meanwhile, the baby is also born with an unusual height, doctors have said.
"The baby's height is 62cm (24.4in) as against the normal Indian baby's height of 50cm," said Dr SR Kumar, who is taking care of the baby at the hospital.
"We have done an ultrasound and conducted blood tests on Nandini, but we didn't find any abnormality," Dr Kumar said. "Have also sent the samples for a test called an inborn error of metabolism. We should get the result after 48 hours."
It is pertinent to note that the heaviest child born in India was a boy in Uttar Pardesh who weighed around 6.7kg, in November 2015.
The world record in this regard was held by a baby boy in Aversa, Italy weighing 10.2kg born in September 1955.
The article originally appeared in BBC
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