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A recently published novel echocardiographic diagnostic algorithm for systematic classification of interatrial communications had inter-and intraobserver agreements superior to standard expert assessment. This study aimed to determine the prevalence of subtypes of interatrial communications on transthoracic echocardiography in newborns. Echocardiograms of newborns aged 0\u201330\u00a0days were prospectively collected in the population-based cohort study Copenhagen Baby Heart Study in 2017\u20132018 and analyzed according to the new diagnostic algorithm, classifying interatrial communications into three subtypes of patent foramen ovale and three subtypes of atrial septal defects. Echocardiograms from 15,801 newborns were analyzed; 3416 (21.6%) were excluded due to suboptimal image quality or severe structural heart disease (<jats:italic>n<\/jats:italic>\u2009=\u20093), leaving 12,385 newborns (aged 12 [interquartile range 8; 15] days, 48.2% female) included in the study. An interatrial communication was detected in 9766 (78.9%) newborns. According to the algorithm, 9029 (72.9%) had a patent foramen ovale, while 737 (6.0%) fulfilled criteria for an atrial septal defect, further divided into subtypes. An interatrial communication was seen on echocardiography in almost 80% of newborns aged 0\u201330\u00a0days. Patent foramen ovale was 12 times more frequent than atrial septal defects. The observed prevalence of atrial septal defects was higher than previously reported. Follow up studies could distinguish which interatrial communications require follow-up or intervention. ClinicalTrial.gov, NCT02753348, posted April 27, 2016, [<jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"https:\/\/classic.clinicaltrials.gov\/ct2\/show\/NCT02753348\" ext-link-type=\"uri\">https:\/\/classic.clinicaltrials.gov\/ct2\/show\/NCT02753348<\/jats:ext-link>].<\/jats:p>","DOI":"10.1007\/s00246-024-03571-0","type":"journal-article","created":{"date-parts":[[2024,7,13]],"date-time":"2024-07-13T12:01:26Z","timestamp":1720872086000},"page":"1570-1580","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Interatrial Communications: Prevalence and Subtypes in 12,385 Newborns\u2013a Copenhagen Baby Heart Study"],"prefix":"10.1007","volume":"46","author":[{"given":"Elisabeth","family":"Blixenkrone-M\u00f8ller","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sofie","family":"Dannesbo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna Maria","family":"Dehn","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christian A.","family":"Pihl","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anne-Sophie","family":"Sillesen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R. 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