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Background: Inflammatory bowel disease (IBD) frequently affects women during their reproductive years. Pregnancy outcome in women with IBD is well described, particularly in retrospective studies., Aim: To evaluate the pregnancy outcome in patients with IBD in a prospective European multicentre case-control study., Methods: Inflammatory bowel disease pregnant women from 12 European countries were enrolled between January 2003 and December 2006 and matched (1:1) to non-IBD pregnant controls by age at conception and number of previous pregnancies. Data on pregnancy and newborn outcome, disease activity and therapy were prospectively collected every third month using a standard questionnaire. Logistic regression analysis with odds ratio was used for statistical analyses. P value<0.05 was considered significant., Results: A total of 332 pregnant women with IBD were included: 145 with Crohn's disease (CD) and 187 with ulcerative colitis (UC). Median age (range) at conception was 31 years (15-40) in CD and 31 (19-42) in UC patients. No statistically significant differences in frequency of abortions, preterm deliveries, caesarean sections, congenital abnormalities and birth weight were observed comparing CD and UC women with their non-IBD controls. In CD, older age was associated with congenital abnormalities and preterm delivery; smoking increased the risk of preterm delivery. For UC, older age and active disease were associated with low birth weight; while older age and combination therapy were risk factors for preterm delivery., Conclusion: In this prospective case-control study, women with either Crohn's disease or ulcerative colitis have a similar pregnancy outcome when compared with a population of non-inflammatory bowel disease pregnant women., (© 2011 Blackwell Publishing Ltd.)