A 12-year-old boy was stabbed during a robbery on a Bronx sidewalk Thursday afternoon, police said.

The teen, who was left in critical but stable condition, was attacked by a trio of robbers who demanded his property, cops said.

The victim was stabbed once in the back and showed up via private means to Jacobi Hospital at about 4 p.,m., police said.

Police did not immediately provide the exact location of the crime.

The suspects made off with the teen’s cell phone, police said. No arrests were made by late Thursday.