Nine children, aged 2 to 16 years, presented with severe Crohn's disease (5 cases) and ulcerative colitis (4 cases). They were given exclusive parenteral feeding 6 times and elementary enteral feeding at constant flow 9 times. In 6 cases, an anti-inflammatory treatment and/or surgical excision were associated. In all cases, immediate results were excellent and permitted to overcome an acute phase. Considering these results, the authors discuss the relative indications of these techniques of nutrition, in the treatment of severe cases of Crohn's disease and ulcerative colitis in children.