Latin American Network of Congenital Malformation registries contributing data to the study
| Country/region | Congenital anomaly registry | Coverage (hospital or population-based)* | Start of data collection | Number of births per year | Microcephaly registration† |
| Argentina | RENAC | National, 40% of all births. (H) | 2009 | 300 000 | A+C |
| Brazil | SINASC—SIM | National. (P) | 2000 | 3 000 000 | A+B to 2016, then C |
| Chile | RENACH | National. (H) | 2016 | 133 000 | A+C |
| Chile—Maule | RRMC-SSM | Regional, Maule district, covers 5.5% of Chile. (P) | 2001 | 13 000 | A+B |
| Colombia—Bogota | CMSP | Bogota DC. (H) | 2006 | 110 000 | A+C |
| Colombia—CALI | CBDSP | City of Cali. (H) | 2011 | 35 000 | A+C |
| Costa Rica | CREC | National system, all births. (P) | 1987 | 70 000 | A+C |
| Mexico—Nuevo Leon | ReDeCon HU-NUEVO LEÓN | Regional. (H) | 2015 | 10 000 | A+C |
| Nicaragua—Leon | SVDC UNAN-LEÓN | Regional, city of Leon. (H) | 2005 | 10 000 | A+C |
*H: hospital-based; P: population-based.
†A: as clinically diagnosed, no national guidelines; B: guidelines for surveillance specify <−3SD; C: guidelines for surveillance specify <−2SD or third percentile.