Jesus Rodriguez, from the northern state of Durango, Mexico, was born with a benign lump, which grew to take over the right side of his body, stretching from his armpit to his hip.
Now, after doctors in Mexico City managed to safely remove the tumour, Jesus is back with his delighted family and on the road to recovery.
Dr Gustavo Hernandez, director of pediatrics at La Raza hospital where the operation took place, said the tumour was heavier than Jesus, who weighed 26 pounds when he went in for surgery two weeks ago.
It took doctors at the Mexico City hospital 10 hours to remove the giant growth, according to Dr Hernandez.
But miraculously, it went without a hitch, and the boy is now recovering well.