Events Within the First Year of Life, but Not the Neonatal Period, Affect Risk for Later Development of Inflammatory Bowel Diseases.

When assessing Crohn’s disease (n = 482) separately from ulcerative colitis (n = 343), maternal history of IBD was strongly predictive for both diseases, and having an infection in the first year life trended toward being predictive but did not reach statistical significance in either disease ( Tables 2 and 3 ).

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