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We evaluated the frequency and severity of GI symptoms in preschool\u2010aged children with ASD compared to participants with typical development (TD). Our goal was to ascertain whether GI symptoms are associated with differences in sex or developmental and behavioral measures. Participants were between 2 and 3.5\u2009years of age and included 255 children with ASD (184 males\/71 females) and 129 age\u2010matched TD controls (75 males\/54 females). A parent interview was used to assess GI symptoms (abdominal pain, gaseousness\/bloating, diarrhea, constipation, pain on stooling, vomiting, difficulty swallowing, blood in stool or in vomit). Children with GI symptoms in each diagnostic group were compared to children without GI symptoms on measures of developmental, behavioral, and adaptive functioning. GI symptoms were reported more frequently in children with ASD compared to the TD group (47.8% vs. 17.8%, respectively). Children with ASD were also more likely to experience multiple GI symptoms (30.6% vs. 5.4%). GI symptoms were equally common in males and females across both diagnostic groups. There were no statistically significant differences in developmental or adaptive measures based on presence of GI symptoms in either ASD or TD children. Co\u2010occurring GI symptoms were, however, associated with increased self\u2010injurious behaviors, restricted stereotyped behaviors, aggressive behaviors, sleep problems and attention problems in both ASD and TD children. In children with ASD, a higher number of GI symptoms was associated with an increase in self\u2010injurious behaviors, somatic complaints, reduced sleep duration, and increased parasomnias.<\/jats:p><\/jats:sec><jats:sec><jats:title>Lay Summary<\/jats:title><jats:p>ASD is characterized by challenges in social communication and repetitive behaviors. But, people with autism have many other difficulties including gastrointestinal problems. Children with ASD were three times more likely to experience GI symptoms than typically developing peers. Increased GI symptoms are associated with increased problem behaviors such as sleep problems, self\u2010injury, and body aches. Since GI symptoms are often treatable, it is important to recognize them as soon as possible. Both clinicians and parents should become more aware of the high occurrence of GI problems in autistic people. <jats:italic><jats:bold>Autism Res<\/jats:bold> 2020, 13: 1778\u20131789. \u00a9 2020 International Society for Autism Research and Wiley Periodicals LLC<\/jats:italic><\/jats:p><\/jats:sec>","DOI":"10.1002\/aur.2354","type":"journal-article","created":{"date-parts":[[2020,8,7]],"date-time":"2020-08-07T05:25:30Z","timestamp":1596777930000},"page":"1778-1789","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":115,"title":["Developmental\u2013behavioral profiles in children with autism spectrum disorder and co\u2010occurring gastrointestinal symptoms"],"prefix":"10.1002","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2341-7357","authenticated-orcid":false,"given":"Bibiana","family":"Restrepo","sequence":"first","affiliation":[{"name":"Division of Developmental and Behavioral Pediatrics, Department of 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USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sally J.","family":"Rogers","sequence":"additional","affiliation":[{"name":"MIND (Medical Investigations of Neurodevelopmental Disorders) Institute University of California at Davis  Sacramento California USA"},{"name":"Department of Psychiatry and Behavioral Sciences University of California at Davis School of Medicine  Sacramento California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jacqueline","family":"Cabral","sequence":"additional","affiliation":[{"name":"Department of Community Health Tufts University  Boston Massachusetts USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brianna","family":"Heath","sequence":"additional","affiliation":[{"name":"MIND (Medical Investigations of Neurodevelopmental Disorders) Institute University of California at Davis  Sacramento California USA"},{"name":"Department of Psychiatry and Behavioral Sciences University of California at Davis 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