What happens to the mulberry colored littlun?

In "Lord of the Flies," the mulberry-colored littlun, often referred to as the "littlun with the birthmark," goes missing after a fire spreads on the island. It is implied that he perished in the blaze, highlighting the tragic consequences of the boys' descent into chaos. His disappearance serves as a poignant reminder of innocence lost and the darker themes of the novel.