A man has pleaded not guilty to assaulting a three-year-old boy in Weyburn.

Andrew Harper was charged with aggravated assault after the toddler was seriously injured at a home in Weyburn earlier this month.

Police say the 32-year-old is known to the victim, but at this point, the exact relationship isn't clear.

The boy remains in critical condition in hospital after undergoing emergency surgery.

Harper is set to return to court Nov. 1.