Under the term of early intervention in childhood, early intervention professionals imply a systematic, proactive and targeted response to the early development of children up to sixth or seventh year of chronological age (pre-school age) with observed developmental disparities, provision of services, support and follow-up to entire family. The aim is to produce a comprehensive impact on minimizing the negative effect of deviations on a child with Autism Spectrum Disorder (ASD) and their families as well as involving the whole family in active participation in society and the community. Early intervention relies on a vision of early-onset of preventative actions with extremely beneficial effects of the treatment on deviating features of the autism spectrum disorders. The aim of this paper was to investigate the structure of existing early intervention services in Osijek, to collect data about demographic characteristics of children with ASD (number and age of children), parents’ experience during early childhood development (before, during and after diagnosis), and services of public institutions for children with ASD and their families. Twenty-two parents participated in the survey and provided information about their children. The results indicate, among others, the lack of early intervention services in qualitative and quantitative terms, the lack of educational rehabilitators and other experts employed in Osijek-based institutions, the insufficiency of education and rehabilitation procedures for children with ASD, the isolation of experts (institutions) in providing early intervention services, lack of information, lack of systematic connectivity and monitoring. The paper also presents guidelines that would improve the quality of providing early intervention services for children with ASD and their families in Osijek and Osijek-Baranja County areas.