In the Harimau Cave in southern Sumatra, the fossilised remains of a mother holding her child were discovered.
The skeletons are only two of 78 unearthed in the cave, and archaeologists believe to belong to the Austronesia and Austromelanesid race, which occupied the area between 14,000 and 3,000 years ago.
The mother and child however, look at though they belong to the older generation, as their remains were discovered over 2m underground.
Apart from human remains, the team also uncovered burial objects, funnel axes and ceramics.
DNA testing is being done on the remains to see if they belong to the suggested inhabitants.