Archie is just two years old and weighs almost six stone, or 84 pounds. He has a rare genetic disease called MOMO syndrome, which belongs to the family of overgrowth syndromes. This disease has only been diagnosed in four cases in the world. The name is an acronym of the four primary aspects of the disorder: Macrosomia (excessive birth weight), Obesity, Macrocephaly (excessive head size) and Ocular abnormalities.