A judge has sentenced Dale Kunath to 10 years, describing his crime as "despicable, disgusting and depraved."
Court heard Kunath lashed out at his girlfriend's six-week old boy because he was upset she was seeing the child's biological father.
Kunath earlier pleaded guilty to aggravated assault.
The judge gave him 21 months credit for time already served, leaving him with a total sentence of eight years and three months.
The Crown had recommended Kunath serve up to 16 years behind bars.
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