Early identification of developmental delays is necessary for successful rehabilitation of young children. In an attempt to unite identification and rehabilitation, in the last 10 years, the concept of early intervention is strengthening in the Republic of Croatia. It is a process of encouraging early childhood development, and includes encouraging parents in their competences and encouraging children to interact with their surroundings, especially kindergarten. It is extremely important that the intervention starts as early as possible, which is why early identification is so important. Identification must be reliable, valid, allencompassing, inexpensive and time efficient. In this research ASQ-3 (Ages and Stages Questionnaire –Third Edition) (Squires et al., 2009) was used to screen for developmental delays in 5 categories: gross and fine motor skills, communication, socio-personal and problem solving.This research was carried out withing the INGI 2015-29 research project at J.J. Strossmayer University in Osijek „Changing the paradigm of teaching in early childhood: constructivism and developmental approaches vs Behavioral Strategies“ in 2016 and 2017. Male children have shown more developmental delays than their female counterparts within the same age group, also delays in communication and motor skills were more prevalent in younger children, while in the older age categories delays in problem solving and sociopersonal skills were more prevalent.