Congenital heart diseases--the most prevalent and fatal birth defects worldwide--result from a combination of genetic predisposition and environmental factors. Currently, there is a growing body of epidemiological literature on parental and occupational prenatal risk factors. We report a case of a 4-months-old infant whose mother was professionally exposed to the cardiovascular catheterization laboratory during the first 4 weeks of pregnancy. The total radiation dose recorded by dosimeters under apron was 4220 microSiviert equivalent to 210 chest X-rays, suggesting the hypothesis of maternal ionising radiation induced-teratogenic effect.