Sumatran elephants are a protected species, but rampant deforestation for plantations has reduced their natural habitat and brought them into conflict with humans.
The newborn was found with its 40-year old mother Seruni, who was being closely monitored by the agency in anticipation of the birth inside a conservation forest in Riau on the island of Sumatra.
Officials expressed jubilation at the arrival of the baby who is believed to be a week old. Its gender has not yet been determined.
"The birth of the elephant is a conservation gift," the agency said in a statement.
"The calf is constantly being guarded by its mother and two other adult elephants."
Most were killed by humans, according to conservationists.
Last month, a pregnant elephant was found dead in a palm oil plantation in Sumatra, in what authorities suspected was a deliberate poisoning.
There are believed to be around 2,000 Sumatran elephants left in the wild.
(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)
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