The tempo driver, Hari Prasad, who had fled the spot after hitting Ankush Kumar, was later traced and arrested.
Ankush's family told police that the incident took place around 9:15 PM soon after Ankush had stepped out of his home with his sister.
The child's head was completely crushed in the impact of the accident.
Ankush was rushed to a hospital where he was declared dead on arrival.
Police said the Eicher tempo was being driven rashly it was being probed whether the driver was under the influence of alcohol.