Deputies were called around 12:45 p.m. to a WinCo Foods supermarket parking lot at 15350 Roy Rogers Dr. and found the 2-year-old girl crying inside the car. The baby's parent or owner of the car could not be found, so the deputy broke out the window.
The deputy said the temperature inside the car was more than 100 degrees.
"She was just screaming, dripping with sweat," said shopper Alicia Matthews, who made the 911 call. "We were trying to talk with her through the window to try to calm her down, but she was just already too upset to do anything."
The baby's mother, Lakisha Treadway, and her boyfriend, Freddie Tate, arrived several minutes later. They had been shopping inside the store and left the child unattended for about 25 minutes before the deputy arrived.
Treadway was put in jail on child endangerment charges. Tate, who is not the baby's father, was cited and released.
The baby was transported to Victor Valley Community Hospital for evaluation and was expected to be OK. She was placed in the custody of Children and Family Services.