The girl received a gash across her forehead and was treated at a local hospital where she needed seven stitches, KTVI-TV reported.
But what really upset the child’s parents is a note the worker sent home explaining that the girl was injured in a “fall.”
"In no world did this family have any idea that what was called a fall was actually an assault until they came to see that video," attorney Jennifer Hansen told KTVI.
The worker was fired five says later after the parents and day care management watched surveillance video of the incident.
Police and state officials are investigating.