Can a kidney infection affect a child's behaviour and emotional state?

???? yes !!!!: Any significant infection can make a kid feel bad and act out.

Yes: A kidney infection can produce unpleasant physical symptoms and discomfort that affect short-term mood and behavior, or until the infection is resolved. Other symptoms and complications if untreated, such as uncontrolled fever or the inability of kidneys to effectively process waste and balance the system, can also alter mental and emotional status.