A High River man who was handed a 10-year prison term for brutally assaulting his ex-girlfriend’s infant son three years ago has lost his bid to appeal the sentence.

Dale Kunath pleaded guilty in 2012 to aggravated assault on the six-week-old boy, admitting he burned the soles of the baby’s feet and mutilated the baby’s penis and anus.

He told court he did it as an act of retaliation against the baby's mother.

In a written decision released Thursday, the Court of Appeal of Alberta dismissed Kunath’s appeal.

“Our decision can be relatively brief because of the thorough and comprehensive sentencing decision, which contains no reviewable errors and is entitled to deference,” the three-judge panel wrote, referring to Court of Queen's Bench Chief Justice Neil Wittmann’s decision in February.

The Court of Appeal judges noted that the case was “exceptionally egregious”, concluding that Wittmann’s sentencing decision was reasonable.

“The judge properly characterized the crimes, appropriately considered the facts, and applied the necessary sentencing principles,” the appeal court said.

With files from Meghan Grant/CBC