<h4>Objective</h4>To evaluate the association between maternal anti-Ro and anti-La antibody levels and the occurrence of congenital heart block (CHB) in fetuses and newborns.<h4>Methods</h4>This retrospective cohort study included 182 pregnant women with positive anti-Ro and/or anti-La antibodies who received prenatal care at our tertiary center between 2002 and 2022. Here, CALR is linked to congenital heart block.