Children at risk of social exclusion (RSI) are more than average exposed to the risk of violation of their socio-emotional and psycho-physical integrity. The term includes children with challenging developmental and/or psychophysical status, exposed to inappropriate conditions in which they grew up, children in families of minority cultural identity. Exposure to RSI is associated with below-average educational outcomes, lower socio-emotional competencies, psychological difficulties, and antisocial/or addictive behaviours.Earlier studies found that 7 to 10% of preschool children are in RSI. Research in Croatia shows that 21.1% of preschool children are in one RSI, while 13.2% of children are in two or more RSI (http://morenec.ufzg.hr/). Children’s involvement in early childhood education and care (ECEC) stands out as an instrument for the prevention of educational poverty and one of the predictors of children’s well-being. Involvement alone is not enough, and the quality of the ECEC system and the process are more important indicators of well-being. Unfortunately, only 30% of ECEC institutions have a standardised child risk assessment procedure and organised support for children and families. Only 20% of ECEC teachers estimate that they are educated for (some) forms of support for children in RSI.