An 18 month-old baby was found alive in a clump of trees days after the devastating tsunami that killed at least 343 people, an official said.
Relief coordinator Hermansyah says the little boy is recovering in a health centre.
The baby was discovered on Wednesday, by a 10 year-old child, in a clump of trees on one of the Pagai Selatan islands.
Both his parents are dead.
The discovery is one of the few bright spots in the tsunami that flattened villages and displaced tens of thousands of people when it hit on Monday.
Residents of the Mentawai chain of islands today dug graves and gathered in makeshift shelters.
Officials say they fear that hundreds of people were swept out to sea and would never be found.