Bottom line: Treatment with oral antibiotics is as effective as parenteral then oral treatment for first episode of acute pediatric pyelonephritis.
Citation: Montini G, Toffolo A, Zucchetta P, et al. Antibiotic treatment for pyelonephritis in children: multicentre randomised controlled non-inferiority trial. BMJ. 2007 Aug 25;335(7616):386.