Police said a mechanic found the infant's body about 1:30 p.m. local time, WMFD-TV, Mansfield, reported. Thinking the smell was from a dead animal, the employee opened the trunk and found the baby's remains in a box in the trunk, and called authorities, the TV station said.
"The car had been at the shop for two days," Shelby Police Chief Charlie Roub said. "The infant's body had been inside the car for longer than two days. It had been inside the trunk for some time."
WEWS-TV, Cleveland, reported police said the child's 17-year-old mother gave birth in January or February in her bedroom in Mansfield. The teenager's parents and the baby's father did not know she was pregnant, WEWS-TV said.
An autopsy was to be performed to determine if the baby was stillborn and the mother was not in custody, the TV station said.