Ontario's highest court has granted Sherry Sherrett a one-week extension to file an appeal.
Sherrett's lawyer said he expects to launch the appeal within the next few days.
The 32-year-old was convicted in the 1996 death of her four-month-old son Joshua.
During an autopsy, Doctor Charles Smith concluded there were signs consistent with homicide on Joshua's body.
Last year, the conviction was called into question after the child's body was exhumed and a second autopsy found no evidence of homicide.