An Amber Alert was issued by police for Magnolia (Maggie) Knox on Friday, just after 3 p.m.
Police say the mother, Sherma Knox, and her child were last seen at 12:08 p.m. in the area of Lebreton Street North and Booth Street, just west of downtown Ottawa.
There are concerns about their safety.
Sherma (39) is described as black, standing 5’7”, weighing around 200 pounds.
She was last seen wearing grey pants, a long black parka, black mesh shoes, a tuque, and a beige backpack.
Meanwhile, Maggie was wearing a striped blue, red and pink shirt, navy-coloured leggings, pink onesie, floral dress, and tan slip-on shoes.