The Southeast Asian country has seen a spike in cases of acute kidney injury (AKI) since August, prompting a probe and subsequent ban on all liquid medicine sales.
More than 320 cases of AKI have been recorded in provinces across the country and 27 patients are still in hospital, health ministry spokesman Mohammad Syahril told a press conference.
Most of the children affected are under the age of five.
The new death toll is up from 133 deaths confirmed on October 21.
Tests found most of the deaths were caused by syrups containing excessive amounts of ethylene glycol and diethylene glycol, two compounds used in industrial products such as antifreeze, Syahril said.
Authorities have since been importing an antidote for AKI, with 246 vials obtained so far, the majority donated by Singapore and Australia, and the drug has shown significant results, the health ministry said.
Indonesia's national food and drug agency last month named five syrups that contained dangerous levels of harmful substances and ordered the products be removed from the market and destroyed.