Screening of perinatal risk factors leading to deviations of physical development and/or mental retardation of the child and their prevention.

We tried to demonstrate some results obtained from the analysis of one selective and one countrywide follow-up study the mode of detection of risk pregnancies and of risk factors that could be the cause of physical and mental congenital defects; the search for optimal form of screening and prevention in these cases; and verification of the effectivity of these measures.