We have analyzed certain epidemiological factors of sudden infant death syndrome (sex, age and infant's nationality, geographic and calendar death distribution, socio-economic conditions, age, marital status and mother's employment). Available statistics reports and death certificates for 22 from the total of 24 registered cases of sudden infant death syndrome during 2000 and 2001 in the Republic of Croatia have been used. There were 11 boys and 11 girls, with a peak incidence of SIDS from 2-4 months of age (total of 14 cases), which is consistent to the international references. As many as 9 mothers have no education or have finished only several grades of primary school, but not a single mother has academic degree. A third of the infants were born in the illegitimate families.