PITTSBURGH -- The mother of a baby killed at a Garfield day care center wants an adult to be held responsible, but authorities in Pittsburgh have declined to file charges.

Rhonda Moore protested Monday morning on Ross Street outside family court downtown, saying that the fault lies with the people who left her daughter with a 7-year-old girl at Bray's Family Day Care.

"I don't feel the 7-year-old is responsible for this," Moore said. "I feel the 20-year-old that left the 7-year-old with my daughter unsupervised is responsible for this, not the 7-year-old."

Police said 10-month-old Marcia Poston's death was a homicide at the hands of a young girl at the now-closed day care on Dearborn Street.

The 7-year-old child took Moore's daughter from a baby chair and threw her twice to the floor on June 6, police said.

One of the suspect's relatives ran the day care, but was doing an errand at the time while another caregiver was upstairs changing a diaper, police said.

The suspect remains in county custody and is scheduled for a hearing in juvenile court. Her name has not been released because of her age.

Spokesman Mike Manko, of the District Attorney's office, said no new charges will be filed unless additional evidence surfaces.