Quebec City police say the autopsy results for two-year-old Rosalie Gagnon, found dead in a garbage bin Wednesday, show she was stabbed to death.

Police are asking residents whose garbage bins have gone missing and who live on or near de Gaulle Avenue to contact 911.

"This could be important information for our investigation," police said in a news release.

Rosalie's body was found in a bin behind a home on de Gaulle in the city's Charlesbourg neighbourhood on Wednesday afternoon. The toddler was pronounced dead in hospital.

Audrey Gagnon, Rosalie's mother, appeared in court Thursday to face charges of breaching probation, obstructing the work of a police officer and mischief.

Const. Cyndi Paré said Gagnon was arrested on suspicion of murder. However, the Crown has not yet said whether she will face additional charges.

"There is no link between the property where the body was found and the child's mother," said Paré.

A bail hearing for Gagnon has been scheduled for next Wednesday.

Police found Gagnon, who was originally reported missing with her daughter, in an apartment on Gaspard Avenue on Wednesday, along with a man.

Radio-Canada spoke to a man who was in that building on Tuesday afternoon.

The man, who did not want to be identified, said he heard a child crying in the apartment that day.

Police were seen digging through dumpsters and recycling bins on de Gaulle Avenue on Friday afternoon. (Radio-Canada)

"She started to cry even louder, and that's when I heard the man next door yelling at her to shut up, that he was tired of hearing her cry. He was punching the walls at the same time as he was yelling at the child," the man said.

"The more he yelled, the harder the child cried."

The man told Radio-Canada that once the mother came home, the child calmed down.

Digging through dumpsters

Police have been seen digging through dumpsters and recycling bins Friday afternoon.

They have also set up a command post at 2900 De Loiret Boulevard in the Beauport borough.

The police's search ended for the day around 8 p.m. Friday.

The command post will be set up again at 8 a.m. Saturday in the same location, they said.

Anyone with information about the case is asked to meet homicide investigators there.