Background: Growth impairment is commonly seen in children diagnosed with inflammatory bowel diseases (IBD), mainly those with Crohn's disease (CD). There is general consensus in the literature that body composition, composed of fat mass and lean mass is altered in children with IBD compared with controls. Evidence regarding the effect of different therapeutic approaches on body composition in children with IBD is scarce and inconsistent. Furthermore, most studies used anthropometric measures and dual energy X-ray absorptiometry (DEXA) for body composition assessment, while information on the usefulness of air displacement plethysmography (ADP) for this assessment is lacking.