The adoption of language begins even before we are born. Listening to language and speech in mothers womb creates the base for all subsequent leaning and acquisition of language, on unconscious level, of course. Speech development takes place spontaneously, that is, it is motivated by the easiest possible way of communication with the environment. Therefore, our primary speech role models are our parents and throughout life, that speech will always be the closest to us. Our speech changes with the influence of the environment and setting out to educational institution, from learning new words to using different accents. Through research for this final paper, I wanted to examine vocabular diversity in children of kindergarten and preschool age, that is, the goal was to see what percentage of children uses standard literary expressions, and what percentage uses dialect expressions, considering their age and gender. The research was carried out by using a card that contained 12 items that children encounter in their everyday life, and their task was to identify and name each item without previous preparation or additional encouragement. The items that were presented were: tomato, pot, plate, bib, ladle, faucet, sneaker, towel, laces, dog, stairs and belt. According to the obtained data, I can conclude that a big number of children uses their native expressions. As for age, there is no significant difference in the answers, that is, they recognize objects equally, while looking by gender we can see the only one concrete difference in the pronunciation of the word dog, which girls pronounce more accurately. Looking at the research, I can conclude that the native language is still quite present among children of kindergarten and preschool age, but standard expressions are also present, which is the proof of multilingualism among Croatian speakers.