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Congenital heart block (CH is associated with a mortality rate of 20% and requires a pacemaker in 70% of cases. Steroids can reduce morbidity and prevent the onset of CHB but may have adverse effects on growth and neurodevelopment. This study aimed to clarify the long-term effects of antenatal betamethasone administration on growth and neurodevelopment. The subjects were children with a high risk of CHB due to a high level of maternal anti-SSA/Ro antibody or a maternal history of a previous delivery of a offspring with CHB to whom anten