The main objective was to identify pregnancy risk factors arising from the behaviour and lifestyle of Mureş county women during pregnancy. The postpartum women monitored in this study were from Mureş county and were interviewed by applying a questionnaire during the period they were in the hospital for postnatal care immediately after birth. The questions aimed at identifying prenatal risk factors and the unhealthy behaviour of women before and during pregnancy, referring to the socio-economic and cultural status (low family income or unemployment, less than high school studies, rural background and marital status), obesity during pregnancy, alcohol consumption, coffee consumption, no physical activity. We identified, among the three major ethnicities in Mureş county (Romanian, Hungarian, Roma), the behaviour and lifestyle components with risk in pregnancy and after comparing profiles of these groups we identified the Roma ethnicity as being at the highest perinatal risk.