She was found around 11:40 a.m. in the 2600 block of West Rosemont Avenue in West Ridge, Chicago police said.
The victim had visible injuries to her lower body, police said.
She was taken to a hospital in critical condition, where she was later pronounced dead.
The Cook County Medical Examiner's Office identified the victim as 1-year-old Maombi Joyeuse.
Chicago police are conducting a death investigation pending a full autopsy.