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SUPC was defined as a collapse within the first 7\u2009days of life in near\u2010term infants with good postnatal adaptation. Maternal, infant and event characteristics were collected. Urine was analysed for prostaglandin E\n                      <jats:sub>2<\/jats:sub>\n                      (PGE\n                      <jats:sub>2<\/jats:sub>\n                      ) metabolites in a subgroup of cases.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      We identified 149 cases of SUPC, corresponding to an incidence of 31 per 100\u2009000 live births, exceeding that of early onset sepsis caused by Group B Streptococcus. Half the SUPC cases occurred during the first four postnatal hours. The mortality was 7% and 26% suffered from neurological sequelae. The highest risk of SUPC coincided with the postnatal peak in PGE\n                      <jats:sub>2<\/jats:sub>\n                      levels.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>\n                      All newborn infants were at risk of SUPC, especially within 24\u2009h of birth. SUPC was associated with early unsupervised skin\u2010to\u2010skin care and bed sharing. Guidelines promoting\n                      <jats:italic>safe<\/jats:italic>\n                      sleep and skin\u2010to\u2010skin care should be implemented to prevent SUPC and save the lives of newborn babies.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/apa.70670","type":"journal-article","created":{"date-parts":[[2026,7,14]],"date-time":"2026-07-14T05:00:55Z","timestamp":1784005255000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Sudden Unexpected Postnatal Collapse: A Retrospective Cohort Study Describing Incidence, Risk Factors and Role of Perinatal Transition"],"prefix":"10.1111","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4719-2201","authenticated-orcid":false,"given":"David","family":"Forsberg","sequence":"first","affiliation":[{"name":"Department of Women's and Children's Health Karolinska Institutet  Stockholm Sweden"},{"name":"Astrid Lindgren Children's Hospital Karolinska University Hospital  Stockholm Sweden"},{"name":"Center for Molecular Medicine, L8:05 Karolinska Institutet  Stockholm Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Louise","family":"Steinhoff","sequence":"additional","affiliation":[{"name":"Department of Women's and Children's Health Karolinska Institutet  Stockholm Sweden"},{"name":"Center for Molecular Medicine, L8:05 Karolinska Institutet  Stockholm Sweden"},{"name":"National Board of Forensic Medicine  Stockholm Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8472-9629","authenticated-orcid":false,"given":"Gustaf","family":"Drevin","sequence":"additional","affiliation":[{"name":"Department of Women's and Children's Health Karolinska Institutet  Stockholm Sweden"},{"name":"Astrid Lindgren Children's Hospital Karolinska University Hospital  Stockholm Sweden"},{"name":"Center for Molecular Medicine, L8:05 Karolinska Institutet  Stockholm Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4041-4729","authenticated-orcid":false,"given":"Helena","family":"Idborg","sequence":"additional","affiliation":[{"name":"Center for Molecular Medicine, L8:05 Karolinska Institutet  Stockholm Sweden"},{"name":"Department of Medicine Solna Karolinska Institutet  Stockholm Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9963-7375","authenticated-orcid":false,"given":"Nicolas J.","family":"Pejovic","sequence":"additional","affiliation":[{"name":"Department of Global Health Karolinska Institutet  Stockholm Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6859-0620","authenticated-orcid":false,"given":"Eric","family":"Herlenius","sequence":"additional","affiliation":[{"name":"Department of Women's and Children's Health Karolinska Institutet  Stockholm Sweden"},{"name":"Astrid Lindgren Children's Hospital Karolinska University Hospital  Stockholm Sweden"},{"name":"Center for Molecular Medicine, L8:05 Karolinska Institutet  Stockholm Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,7,13]]},"reference":[{"key":"e_1_2_13_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/apa.12244"},{"key":"e_1_2_13_3_1","doi-asserted-by":"publisher","DOI":"10.1007\/s12975\u2010013\u20100255\u20104"},{"key":"e_1_2_13_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/apa.13391"},{"key":"e_1_2_13_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/apa.13676"},{"key":"e_1_2_13_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/acem.14881"},{"key":"e_1_2_13_7_1","doi-asserted-by":"publisher","DOI":"10.1177\/0009922815591890"},{"key":"e_1_2_13_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.mjafi.2025.06.008"},{"key":"e_1_2_13_9_1","doi-asserted-by":"publisher","DOI":"10.1136\/adc.2010.208736"},{"key":"e_1_2_13_10_1","doi-asserted-by":"publisher","DOI":"10.1542\/peds.2016\u20101889"},{"key":"e_1_2_13_11_1","doi-asserted-by":"publisher","DOI":"10.1111\/jpc.12818"},{"key":"e_1_2_13_12_1","doi-asserted-by":"publisher","DOI":"10.1053\/j.nainr.2013.12.009"},{"key":"e_1_2_13_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jpeds.2015.08.053"},{"key":"e_1_2_13_14_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.0611468104"},{"key":"e_1_2_13_15_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.resp.2011.06.026"},{"key":"e_1_2_13_16_1","unstructured":"British Association of Perinatal Medicine \u201cSudden and Unexpected Postnatal Collapse: A BAPM Framework for Reducing Risk Investigation and Management \u201d 2022 https:\/\/www.bapm.org\/resources\/sudden\u2010and\u2010unexpected\u2010postnatal\u2010collapse\u2010supc."},{"key":"e_1_2_13_17_1","doi-asserted-by":"publisher","DOI":"10.1891\/NN\u20102023\u20100059"},{"key":"e_1_2_13_18_1","unstructured":"E. 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