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In Switzerland, 35 to 50% of children are vitamin D deficient. Due to skin colour, poor nutrition, living conditions and cultural practices, migrant population is particularly at risk. Our aim is to attest the prevalence of hypovitaminosis D in children arriving in Switzerland. We retrospectively assessed 528 children\u2019s vitamin D status and parathyroid hormone, phosphate and calcium levels between 2015 and 2018 by electrochemiluminescence and spectrophotometry. Cholecalciferol was considered insufficient under 50 nmol\/L and severely deficient below 25 nmol\/L. Seventy-three percent of children showed hypovitaminosis D and 28% had a severe deficiency. Highest prevalence of deficiency was found in children from Eastern Mediterranean (80%) and African regions (75%). Severe deficiency was more prevalent in the South East Asian (39%) and Eastern Mediterranean regions (33%) and more frequent in females. Deficiency was more frequent and more severe in winter. Hypovitaminosis D increased with age. Two children presented with all three biological manifestations associated to severe hypovitaminosis D (hyperparathyroidism, hypocalcaemia and hypophosphatemia).<\/jats:p><jats:p><jats:bold><jats:italic>Conclusion<\/jats:italic><\/jats:bold>: A majority of migrant children presented with hypovitaminosis D. They should be supplemented to prevent complications. A strategy could be to supplement all children at arrival and during wintertime without regular vitamin D level checks.\n<jats:table-wrap><jats:table><jats:tbody>\n                    <jats:tr>\n                      <jats:td colspan=\"2\">What is Known:<jats:italic>Hypovitaminosis D is frequent in children and can lead to bone-related complications.<\/jats:italic><jats:italic>Migrant children are particularly at risk of deficiency.<\/jats:italic><\/jats:td>\n                    <\/jats:tr>\n                    <jats:tr>\n                      <jats:td colspan=\"2\">What is New:<jats:italic>Three-quarters of migrant children evaluated at our migrant clinic in Geneva\u2019s children hospital are deficient in vitamin D, one third severely.<\/jats:italic><jats:italic>A strategy to correct the deficiency would be to supplement all migrant children at arrival and in winter.<\/jats:italic><\/jats:td>\n                    <\/jats:tr>\n                  <\/jats:tbody><\/jats:table><\/jats:table-wrap><\/jats:p>","DOI":"10.1007\/s00431-021-04143-7","type":"journal-article","created":{"date-parts":[[2021,6,15]],"date-time":"2021-06-15T14:03:02Z","timestamp":1623765782000},"page":"2637-2644","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Hypovitaminosis D in migrant children in Switzerland: a retrospective study"],"prefix":"10.1007","volume":"180","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6578-1034","authenticated-orcid":false,"given":"Olivia","family":"Fahrni","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9677-892X","authenticated-orcid":false,"given":"Alexandra","family":"Wilhelm-Bals","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9464-5704","authenticated-orcid":false,"given":"Klara M.","family":"Posfay-Barbe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"No\u00e9mie","family":"Wagner","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,6,15]]},"reference":[{"key":"4143_CR1","first-page":"384","volume":"15","author":"E Gonzalez Nguyen-Tang","year":"2019","unstructured":"Gonzalez Nguyen-Tang E, Parvex P, Goischke A, Wilhelm-Bals A (2019) Carence en vitamine D et rachitisme : d\u00e9pistage et traitement, aspects pratiques pour le clinicien. 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Ethical approval was granted by the institutional ethics committee (Comission cantonale d\u2019\u00e9thique de la recherche CCER) on January 24, 2019 (study number: ID 2016-01278).","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval"}},{"value":"The authors declare no competing interests.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}}]}}