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Identifying early risk markers may facilitate earlier intervention and reduce long-term burden. Although birth weight has been widely studied in relation to NDDs, evidence from clinically ascertained samples with single and overlapping diagnoses remains limited. In this case-control study, we compared birth weight between clinically referred individuals with intellectual disability (ID), autism spectrum disorder (ASD), and attention-deficit\/hyperactivity disorder (ADHD) from the Norwegian BUPgen registry (\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u2009720) and a population-based sample from the Norwegian Mother, Father and Child Cohort Study (MoBa) (\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u200998,716). Perinatal data were obtained through linkage to the Medical Birth Registry of Norway. Associations were examined using logistic regression adjusted for gestational age, sex, and parental age. Additional analyses assessed interactions by sex and parental age, and birth weight categories. For each 100\u00a0g decrease in birth weight, odds significantly increased for the groups any NDD (one or more NDD diagnoses; OR\u2009=\u20091.04) and multiple diagnoses (two or more co-occurring NDDs; OR\u2009=\u20091.07). In diagnosis specific analyses, odds significantly increased for ID (OR\u2009=\u20091.15) and ASD (OR\u2009=\u20091.03). No interactions were observed. In categorical analyses, low birth weight was associated with higher odds of ID (OR\u2009=\u20098.27,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.001), multiple diagnoses (OR\u2009=\u20094.96,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.001), and any NDD (OR\u2009=\u20092.11,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009=\u20090.002). No associations were observed for high birth weight. These findings support low birth weight as an early marker of neurodevelopmental vulnerability across NDD outcomes.\n                  <\/jats:p>","DOI":"10.1007\/s10578-026-02090-8","type":"journal-article","created":{"date-parts":[[2026,8,26]],"date-time":"2026-08-26T07:15:38Z","timestamp":1787728538000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Birth Weight and Neurodevelopmental Disorders Across Diagnostic Categories: A Registry-Based Case\u2013Control Study in Clinically Ascertained Samples"],"prefix":"10.1007","author":[{"given":"Eden Nordvold","family":"Barak","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Knut K.","family":"Kolsk\u00e5r","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christine","family":"Dahl","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dag","family":"Aln\u00e6s","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ole A.","family":"Andreassen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Terje","family":"N\u00e6rland","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ida E.","family":"S\u00f8nderby","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christian K.","family":"Tamnes","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lars T.","family":"Westlye","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,8,26]]},"reference":[{"key":"2090_CR1","doi-asserted-by":"publisher","DOI":"10.1176\/appi.books.9780890425787","author":"American Psychiatric Association","year":"2022","unstructured":"American Psychiatric Association (2022) Diagnostic and Statistical Manual of Mental Disorders. text rev. 5th ed.,https:\/\/doi.org\/10.1176\/appi.books.9780890425787","journal-title":"text rev"},{"key":"2090_CR2","doi-asserted-by":"publisher","unstructured":"Pallanti S, Salerno L (2023) Neurodevelopmental disorders (NDDs): Beyond the clinical definition and translational approach. 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