A High River, Alta., man who admitted to brutally assaulting his former girlfriend's six-week-old infant was sentenced to 10 years in prison in a Calgary courtroom Monday morning.

Dale Kunath pleaded guilty to assaulting the infant to get back at the child's mother last August.

Kunath burned the soles of the baby's feet and injured the child's genitals.

Court of Queen's Bench Chief Justice Neil Wittmann called Kunath's brutal assault "despicable, depraved and disgusting" against "the most vulnerable" in society. 

With time served, Kunath will be behind bars for eight years and three months for aggravated assault.

The baby’s mother, who cannot be identified, said the sentence is appropriate. 

"I often blame myself, as a mom our obligation is to protect our kids. I feel like I failed," she said.

Det. Lionel Busch of the Calgary Police Services child abuse unit, who led the investigation, said it was a very difficult case.

"I find this a very satisfying conclusion, it's a really good sentence in the Canadian legal system and I feel justice has been done," he said.