With temperatures reaching the 90s this week, THP Colonel Tracy Trott said heat can build to intolerable levels inside a vehicle in a few minutes.
There were 32 children who died in hot cars last year nationwide. Five of those deaths occurred in Tennessee.
Last June, 5-year-old Leland Bates and his 3-year-old brother, River Bates, died in Cleveland. The younger child's core body temperature was measured at 109 degrees. Their mother, Tasha Bates, was criminally charged.
The THP recommends placing a cellphone, purse or other valuable on the back seat floor in front of a child in a restraint seat. When the driver retrieves the item, the child's presence will be obvious.