A utility worker discovered the child in a box on Meadowbrook Drive, off Highway 544, in some woods near Conway.
On Monday, Chris Burroughs, with the Horry County Coroner's Office said they still cannot determine how the baby died, but reiterated the infant was alive when he was born.
Burroughs says there were no signs of abuse or trauma to the child's body and adds pending toxicology results could provide more insight.
Police are investigating the case as a homicide, but say it's too early to speculate about possible charges.
Sgt. Robert Kegler said detectives have yet to formulate a theory but are checking all avenues including hospital records, high schools and colleges.
"It's very difficult. We have a child who's deceased, and we have no idea who it belongs to," Kegler said.
Several people drove by the scene on Monday to pay their respects.
"I haven't been able to get it off my mind since it happened," said Barb Johnson who lives in the nearby Myrtle Trace subdivison.
Others, like Melba Richmond, who live in the neighborhood, where the infant's body was found, say they wish they could have helped or known the baby was lying so close to where they pass by everyday.
"I just wish so much that one of those days that baby was out there would have been one of the days I was walking," said Richmond.
A young couple with a 5-month-old son came by to add to a memorial that's been placed at the scene of where the newborn was found. It consists of a cross with several stuffed animals.
"This baby needs somebody to love it, and so we brought some animals out here for it and a stocking," the young mother said.
Police urge people to call with any information. They say no tip is too small. They say it's going to be difficult to solve without the public's help.
The number to the tipline is (843) 915-TIPS.