Shelby police Chief Charlie Roub says the girl told investigators Tuesday night that she didn't know she was pregnant and gave birth at home in late January or early February.
The Mansfield News Journal reports the infant's body was inside a copy paper box in the trunk of the car taken to a northern Ohio repair shop.
Investigators say a mechanic found the infant's body on Tuesday after noticing an odor coming from the trunk.
Roub says the girl is a local resident who has not been taken into custody.
Information from: News Journal, http://www.mansfieldnewsjournal.com
Copyright 2013 The Associated Press.