The child's socio-emotional development is of utmost importance fot the child's psychological development. The first three years of life are the period of fastest growth and development of all the child's abilities. Due to the increased plasticity of the brain, much can be achieved during this period in the development of a child, especially in children even the smallest disabilities. For this reason, there is a need to develop tools or standardize existing ones for the purpose of identifying children with disabilities as early as possible in order to approach early intervention and provide appropriate support to the child before problems arise. The purpose of this research is to examine the validity and reliability of SEAM tools for assessing a child's social and emotional abilities and parents ability to encourage them. This pilot study involved 168 children and parents up to 66 months of age. The research was carried out in the Kindergartens and Trades for children gurdning in Rijeka and the surrounding community. Parents completed a SEAM child and family assessment questionnaire. Questionnaires for infants (2 to 18 months), toddler (18 to 36 months) and preschool childeren (36 to 66 months) were completed. By processing the SEAM data, the child and family assessment questionnaire of this pilot study has proven to be highly valid and reliable for assessing the child's social and emotional abilities and parents ability to encourage them.