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The success of epidemiologic surveillance depends on numerous factors, including the accuracy of the rates available in the base period, wide population coverage, and short periodicity of analysis. This study aims to describe the Latin American network of congenital malformation surveillance: ReLAMC, created to increase epidemiologic surveillance in Latin America. We describe the main steps, tasks, strategies used, and preliminary results. From 2017 to 2019, five national registries (Argentina [RENAC], Brazil [SINASC\/SIM\u2010BRS], Chile [RENACH], Costa Rica [CREC], Paraguay [RENADECOPY\u2010PNPDC]), six regional registries (Bogot\u00e1 [PVSDC\u2010Bogota], Cali [PVSDC\u2010Cali], Maule [RRMC SSM], Nicaragua [SVDC], Nuevo\u2010Le\u00f3n [ReDeCon HU], S\u00e3o Paulo [SINASC\/SIM\u2010MSP]) and the ECLAMC hospital network sent data to ReLAMC on a total population of 9,152,674 births, with a total of 101,749 malformed newborns (1.1%; 95% CI 1.10\u20131.12). Of the 9,000,651 births in countries covering both live and stillbirths, 88,881 were stillborn (0.99%; 95% CI 0.98\u20130.99), and among stillborns, 6,755 were malformed (7.61%; 95% CI 7.44\u20137.79). The microcephaly rate was 2.45 per 10,000 births (95% CI 2.35\u20132.55), hydrocephaly 3.03 (2.92\u20133.14), spina bifida 2.89 (2.78\u20133.00), congenital heart defects 15.53 (15.27\u201315.79), cleft lip 2.02 (1.93\u20132.11), cleft palate and lip 2.77 (2.66\u20132.88), talipes 2.56 (2.46\u20132.67), conjoined twins 0.16 (0.14\u20130.19), and Down syndrome 5.33 (5.18\u20135.48). Each congenital anomaly showed heterogeneity in prevalence rates among registries. The harmonization of data in relation to operational differences between registries is the next step in developing the common ReLAMC database.<\/jats:p>","DOI":"10.1002\/ajmg.c.31872","type":"journal-article","created":{"date-parts":[[2020,12,15]],"date-time":"2020-12-15T12:55:45Z","timestamp":1608036945000},"page":"1078-1091","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":37,"title":["The Latin American network for congenital malformation surveillance:\n                    <scp>ReLAMC<\/scp>"],"prefix":"10.1002","volume":"184","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1863-6229","authenticated-orcid":false,"given":"I\u00eada Maria","family":"Orioli","sequence":"first","affiliation":[{"name":"ReLAMC (Latin American Network of Congenital Malformation Surveillance) at Department of Genetics Institute of Biology, Federal University of Rio de Janeiro  Rio de Janeiro Brazil"},{"name":"Instituto Nacional de Gen\u00e9tica 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