<Tr> <Th_colspan="2"> Classification and external resources </Th> </Tr> <Tr> <Td_colspan="2"> (edit on Wikidata) </Td> </Tr> <P> Blue baby syndrome refers to at least two situations that lead to cyanosis in infants: cyanotic heart disease and methemoglobinemia . The most common cyanotic heart defects include transposition of the great vessels, tetralogy of Fallot, persistent truncus arteriosus, tricuspid atresia and total anomalous pulmonary venous return . </P> <P> A number of cardiovascular defects may lead to Blue baby syndrome, including the following: </P>

What does it mean when a baby is born blue
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