Hospitalized children with severe Ulcerative Colitis who are steroid unresponsive often receive Infliximab (IFX). Standard IFX induction dose is 5mg/kg weeks 0, 2 & 6. The rationale for intensified infliximab induction (III) in severe UC is: higher inflammatory burden, increase in IFX clearance & stool losses. There are no pediatric data on the outcomes of III.