Congenital anomalies are poorly ascertained in US vital statistics.
Kirby
Russell S
RS
D000013:Congenital Abnormalities / Q000145:classification / Q000453:epidemiology*; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D008423:Maternal Age; D011159:Population Surveillance; D011996:Records; D012042:Registries; D050497:Stillbirth / Q000453:epidemiology; D014481:United States / Q000453:epidemiology; D014798:Vital Statistics