Investigators continued Wednesday to identify the baby's mother, and have sought the public's help via a Facebook video.
The baby girl appeared to be white, Hispanic or Asian, the sheriff's office said.
Two bathroom items were found with the baby - a brown toilet lid cover and a brown bath rug.
Anyone with information about the case is asked to call the DuPage County Sheriff's Office at 630-407-2400.
The baby's body was discovered by landscapers trimming trees in unincorporated Wheaton around 3 p.m. Monday. They spotted a small, black backpack on the side of a private drive just off Plamondon Road. When they opened it, they discovered the newborn's body inside, with a blanket.
On Tuesday, bouquets of flowers and a memorial with a cross with a heart that reads "Baby Doe" marked the spot where the discovery was made.