A former Frederick County YMCA employee has been charged with child abuse and assault after allegedly beating a child while at work.

The day care worker -- identified in court records as 21-year-old Amanda Markoe -- faces charges of second-degree child abuse and second-degree assault. 

The boy's mother, Becky King, tells ABC 7's Brad Bell that she only found out about the incident when she inquired why her son came home wearing a pair of dirty socks that were not his.

The YMCA reviewed a videotape of the classroom that day, finding what it termed "inappropriate treatment" of a child.

The YMCA showed the video to King, who says she saw,"[a] teacher hitting [her son] in his stomach with her forearm three times, pushing him back. A minute and a-half goes by, she comes back and she kicks him a couple times, walks back over to the bulletin board, then comes back over, hits him across the face with a bag of the letters or numbers -- whatever she's putting on the bulletin board -- kicks him again, and comes back and kicks him a couple more times and hits him in the back of his head."

The YMCA contacted police and Child and Family Services about the incident.

"We discovered it; we uncovered it; we took the appropriate measures," said YMCA Chief Executive Officer Daria Putnam-Steinhardt. "That it happened at all is very difficult, because we are all about children here. But the welfare of the child is our first concern."

Putnam-Steinhardt says the employee had worked at the Child Development Center in Frederick for a little over two years.

King says her son was traumatized by the incident, and she wants the day care worker locked up.

"He's having nightmares; he's getting into counseling. We even ride by the YMCA and he starts screaming. Let her feel some of the fear my son felt," she said.