Two-year-old Pang Ya is already tipping the scales at 41.3 kilograms.
The toddler's size means she now weighs the same as an average female Chinese adult.
Although her alarmed parents admit that their daughter has a healthy appetite, they are desperate for help, reports The Mail, London.
Pang Ya poses next to a healthy two-year-old Chinese friend
Her father said: ‘Doctors can't figure out the reasons for her obesity, which worries us a lot.'
Pang Ya, who is from Taocun town, Shanxi province, was born weighing an average eight pounds.
A recent government survey declared there are 60 million obese people in China, with the number doubling between 1992 and 2002.
Two years ago the country got its first Kentucky Fried Chicken fast food restaurant.
Pang Ya was born weighing an average 3.6 kilograms but has become heavy very quickly