First responders immediately provided the baby with first aid, and she was taken to the hospital, where she was found to be in good condition, Forsyth County Sheriff Ron Freeman told reporters on Friday.
"It is without doubt a divine intervention this child was found. Had it not been for those observant folks who are our citizens who called 911, we would be having a much different conversation today," Freeman said.
The sheriff said the child is either white or Hispanic, and was born full-term — most likely a few hours before she was discovered in Cumming.
Freeman also emphasized Georgia's Safe Haven Law, which he said allows parents to surrender their newborns safely.
"Georgia Safe Haven Law allows a mother up to 30 days after the birth of an infant to drop that infant off at a hospital, a fire station, a police station, a sheriff's station," he said. "As long as they turn it over to a person, a live human being, they cannot be charged with abandonment, cruelty to children. It is a way to make sure that a child like this is safely cared for."
Investigators are asking the public to share any knowledge of a woman in the late stages of pregnancy who may have given birth to the baby, who is currently in the custody of the Georgia Divison of Family and Children's Services.
Anyone with information on the situation or the whereabouts of the baby's mother is urged to contact the Forsyth County Sheriff's Office at 770-781-3087 or contact their anonymous tip line at 770-888-7308.
The Associated Press contributed to this report.