Jeremy Sweet, 41, was sentenced to in prison in a Bartholomew County courtroom on Tuesday.
An ISP trooper said he suspected the car had illegal drugs in it.
According to court documents, 32-year-old Andrew Beck and 29-year-old Mandy Dowden were booked into the Jackson County Detention Center on Friday.
Detectives say Jeremy told them he fell asleep on Nov. 24, and when he woke up, "Emma and her coat were gone."
Police say the child was "basically lifeless" when arriving at the emergency room.
Police responded to a 911 call about an unresponsive child at an address on Poplar Street in Pekin, Indiana.
Police said the child is expected to survive.
When ISP Trooper Justin Geltmaker found the vehicle, which was not running, he noted that the temperature was near 37 degrees, though with wind chill, the temperature was 28.
Police in Columbus, Indiana arrested a 29-year-old woman this week after officers found her young son wandering alone on a road, bleeding from a wound on his ankle.
Amanda Carmack told a judge Monday morning that she "doesn't need a lawyer."