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It became a priority to clarify any risks associated with COVID\u201019 infection, and later vaccination, to pregnant women and their offspring. The Nordic registries constituted unique resources to quickly answer these questions. Our findings from the Nordic registries demonstrated that pregnant women with COVID\u201019 face a higher risk of hospitalization compared to non\u2010pregnant women of reproductive age, and a higher risk of venous thromboembolism and stillbirth. However, the majority of studies proved no COVID\u201019 associated risks of adverse pregnancy outcomes. We also provided reassuring evidence indicating no increased risk of miscarriage, stillbirth, congenital malformations, preterm birth, or other adverse neonatal outcomes in children born to mothers vaccinated against COVID\u201019 during pregnancy. In this commentary, we highlight both opportunities and methodological challenges when using the Scandinavian health registries during an ongoing pandemic crisis.<\/jats:p>","DOI":"10.1111\/aogs.70330","type":"journal-article","created":{"date-parts":[[2026,8,7]],"date-time":"2026-08-07T09:43:20Z","timestamp":1786095800000},"page":"2126-2134","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Preparedness for maternal and offspring health surveillance in pandemics: Lessons learned from studies on\n                    <scp>COVID<\/scp>\n                    \u201019 using Scandinavian registry data"],"prefix":"10.1111","volume":"105","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0568-3774","authenticated-orcid":false,"given":"Maria C.","family":"Magnus","sequence":"first","affiliation":[{"name":"Centre for Fertility and Health Norwegian Institute of Public Health  Oslo 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