The PROMPT BOLUS study is a multicentre, pragmatic, randomised controlled trial aimed to test the safety of Balanced Fluids (eg. Hartmann's Solution, plasmaLyte) compared tp 0.9% Normal Saline for fluid resuscitation in children with septic shock. This is an international study lead by the PECARN network in the USA, which will also involve the Canadian PERC network and Australia and New Zealand PREDICT network. Paediatric patients age > 6 months to <18 years with clinician concern for septic shock, who have recived at least 20mL/kg intravenous/intraosseous fluid resuscitation, will be randomised to recieve eithr 0.9% Normal Saline or Balanced solution fluid bolus therapy. The primary outcome will be the incidence of Major Adverse Kidney Events within 30 days of randomisation. Please see the attached trial protocol for further details. study enrolment will be in the Royal Darwin hospital and Palmerston Regional Hospital Emergency departments. Enrolled patients will participate in the study for 90 day, including 1-2 days for study intervention, and up to 90 days for follow up. A research assistance will be employed to gain consent from families and collect data.