The boy has been identified as Rowan Frensley, WTVF reported.
Emergency crews rushed the boy to a nearby hospital with critical injuries, including head trauma, the news outlets reported.
On Saturday night, the Tennessee Highway Patrol's Nashville District, which is investigating the incident, tweeted that the boy had died.
"It is with great sadness that victim of today's parade incident in Mount Juliet has passed away," the district wrote. "Please lift up this family at very difficult time."
It is with great sadness that victim of today’s parade incident in Mt Juliet has passed away. Please lift up this family at very difficult time.
— THPNashville (@THPNashville) December 15, 2019
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