The world's fattest boy weighs 197kg at just 10 years old.

The world's fattest boy weighs 197kg at just 10-years-old and will have to undergo weight loss surgery in order to save his life.

Mohammed Arbrar, from Pakistan, struggles to stand after regularly scoffing meals meant to feed four adults.

Despite weighing just 3.6kg at birth, his parents say they were stunned when he began gaining weight rapidly and tipped the scales at 19kg when he was just six months old.

His doctors say he is the fattest boy in the world - weighing even more than Indonesian Arya Permana, who hit headlines when he was revealed to weigh 184kg three years ago.

His parents, who have two other healthy children, say they had never heard of obesity.

As an infant, he was always hungry and would drink five times as much milk as his elder siblings - downing two litres at every feed.

He was so heavy that his mother could not change his nappies alone and had to get a specially-made bed to take his weight.

He's undergoing weight loss surgery to save his life.

She said: "He used to drink two litres of milk when he was only two years old. It was like his stomach never filled up. He always cried for more food.

"It was very difficult for me to even carry him. We had to make a special swing and a bed for him to change nappies."

With his massive frame, even basic activities like walking and sitting are an uphill task for the pre-teen boy.

Despite having three siblings, an older brother and a sister and one younger sister, Mohammed cannot play with them.

He has never been to school as he cannot take more than three steps at a time.

But now, his parents are hopeful that Abrar would be back to a normal weight after the country's best-known bariatric surgeon, Dr Maaz ul Hassan, has agreed to perform a life-saving surgery on him.

Bariatric surgery includes a variety of procedures, including gastric band surgery, on people who have obesity.

He has never been to school because he can barely walk .

While Abrar's parents made a conscious decision to never feed him junk food, he could easily gobble down four plates of rice or 10 chapattis with chicken curry at one go.

His mother said said: "His hunger was never satiated. Whatever I cooked, he would finish half the food and the rest of the food was eaten by five of us."

Abrar's alarmed parents took him to several doctors to seek medical help, putting him on strict diets but young Abrar could not follow the regimen often giving up on it due to his appetite.

The desperate parents finally met Dr Maaz two months ago who showed them a way through bariatric surgery- a procedure of achieving weight loss by reducing the size of the stomach and gastric band.