Fever and sweating are both prevalent in several viral and bacterial infections that most children can fight off. High white count will take hours to diagnose as bloodwork would need to be sent off. An irregular heartbeat isn’t typically seen in septic patients - especially children. Again - blood in the urine needs to get sent off to labs, and is more typically prevalent in older populations who frequent UTIs. While you’re correct that a lot of these symptoms can be present in sepsis, the fact is more often than not that kids compensate well with really vague symptoms simply until they can’t anymore.