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We compared birth outcomes of women with and without a documented diagnosis of <jats:styled-content style=\"fixed-case\">IBD<\/jats:styled-content>.<\/jats:p><\/jats:sec><jats:sec><jats:title>Main outcome measures<\/jats:title><jats:p>Caesarean section, severe maternal morbidity, preterm birth &lt;37\u00a0weeks of gestation, planned preterm birth, small\u2010for\u2010gestational\u2010age (birthweight &lt;10th centile), perinatal mortality (stillbirth\/neonatal death \u226428\u00a0days).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>In all, 1960 women (0.31%) with <jats:styled-content style=\"fixed-case\">IBD<\/jats:styled-content>, who had 2781 births (1183 <jats:styled-content style=\"fixed-case\">UC<\/jats:styled-content>, 1287 <jats:styled-content style=\"fixed-case\">CD<\/jats:styled-content> and 311 <jats:styled-content style=\"fixed-case\">IBD<\/jats:styled-content>\u2010indeterminate). Women with <jats:styled-content style=\"fixed-case\">IBD<\/jats:styled-content> were more likely than women without <jats:styled-content style=\"fixed-case\">IBD<\/jats:styled-content> to have a caesarean section [41.5 versus 28.2%, adjusted risk ratio (<jats:styled-content style=\"fixed-case\">aRR<\/jats:styled-content>) 1.38, 95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content> 1.31\u20131.45], severe maternal morbidity (2.6 versus 1.6%, <jats:styled-content style=\"fixed-case\">aRR<\/jats:styled-content> 1.54, 95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content> 1.17\u20132.03), preterm birth (9.7 versus 6.6%, <jats:styled-content style=\"fixed-case\">aRR<\/jats:styled-content> 1.47, 95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content> 1.30\u20131.66), planned preterm birth (5.3 versus 2.9%, <jats:styled-content style=\"fixed-case\">aRR<\/jats:styled-content> 1.74, 95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content> 1.47\u20132.07), and their infants to be small\u2010for\u2010gestational\u2010age (9.7 versus 9.5%, <jats:styled-content style=\"fixed-case\">aRR<\/jats:styled-content> 1.19, 95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content> 1.04\u20131.36). There was no evidence of a difference in perinatal mortality.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Pregnancy\u2010associated <jats:styled-content style=\"fixed-case\">IBD<\/jats:styled-content> is more common than previously reported. Pregnancies complicated by <jats:styled-content style=\"fixed-case\">IBD<\/jats:styled-content> at or near the time of birth have significantly higher rates of adverse pregnancy outcomes than pregnancies of women without <jats:styled-content style=\"fixed-case\">IBD<\/jats:styled-content>.<\/jats:p><\/jats:sec><jats:sec><jats:title>Tweetable abstract<\/jats:title><jats:p>Increased rates preterm birth and caesarean section in women with inflammatory bowel disease.<\/jats:p><\/jats:sec>","DOI":"10.1111\/1471-0528.13946","type":"journal-article","created":{"date-parts":[[2016,2,29]],"date-time":"2016-02-29T06:13:00Z","timestamp":1456726380000},"page":"1862-1870","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":81,"title":["Inflammatory bowel disease in pregnancy: a population\u2010based study of prevalence and pregnancy outcomes"],"prefix":"10.1111","volume":"123","author":[{"given":"AW","family":"Shand","sequence":"first","affiliation":[{"name":"Clinical and Population Perinatal Health Research Kolling Institute University of Sydney Sydney NSW Australia"},{"name":"Department of Maternal Fetal Medicine Royal Hospital for Women Randwick NSW Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"JS","family":"Chen","sequence":"additional","affiliation":[{"name":"Clinical and Population Perinatal Health Research Kolling Institute University of Sydney Sydney NSW Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"W","family":"Selby","sequence":"additional","affiliation":[{"name":"AW Morrow Gastroenterology and Liver Centre Royal Prince Alfred Hospital Camperdown NSW Australia"},{"name":"Faculty of Medicine Central Clinical School University of Sydney Sydney NSW Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M","family":"Solomon","sequence":"additional","affiliation":[{"name":"SOuRCe (Surgical Outcomes Research Centre) The Institute of Academic Surgery Royal Prince Alfred Hospital University of Sydney Camperdown Sydney NSW Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"CL","family":"Roberts","sequence":"additional","affiliation":[{"name":"Clinical and Population Perinatal Health Research Kolling Institute University of Sydney Sydney NSW Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2016,2,29]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.3748\/wjg.v18.i15.1723"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1053\/j.gastro.2011.10.001"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/ibd.21209"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.3748\/wjg.v17.i22.2696"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1136\/gutjnl-2013-305607"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1038\/ajg.2010.464"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.3748\/wjg.v20.i23.7123"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1136\/gut.2005.090316"},{"key":"e_1_2_7_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.crohns.2010.07.004"},{"key":"e_1_2_7_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cgh.2012.08.018"},{"key":"e_1_2_7_12_1","first-page":"1091","article-title":"Birth outcomes in women with inflammatory bowel disease: effects of disease activity and drug exposure","volume":"20","author":"Broms G","year":"2014","journal-title":"Inflamm Bowel Dis"},{"key":"e_1_2_7_13_1","unstructured":"Centre for Health Record Linkage. 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