CEDAR RAPIDS, Iowa (AP) — A Cedar Rapids woman accused of breaking the leg of a baby in her care has been charged with child endangerment causing serious injury.

Cedar Rapids television station KCRG reports that 21-year-old Victoria Stastny was operating a child day care when the 1-year-old boy was injured on July 18. The boy’s mother reported that he was screaming when she picked him up from the day. She took him to a hospital, which discovered a spiral fracture in his left femur.

Police say Stastny admitted becoming frustrated with the boy and tossing him “from one couch to another.”

If convicted, Stastny faces up to 10 years in prison. Court records indicate she is representing herself in the case.