The theme of this paper is "Exercises in Observation – Spring". The work is conceptualized in two parts; the first part of the paper is theoretical, while the second refers to the practical part, the activities carried out in kindergarten. The first part defines observation according to Rosandić (1969) as a method of cognition, a methodical procedure in which the observer directs attention to a selected object with a specific goal. The purpose of the observation is described, just as the objects of the observation and the ways in which the observation can be carried out are explained. Furthermore, linking to descriptive and lexical exercises has been made, which are also briefly explained. In a subchapter, the realization of observations is described, where the process from the very beginning – the selection of the object of observation – to the expression of the observed details of the object is described. In continuation, the influence of the literary template and reading, especially the picture book, on speech and expression is described. The second part of the paper refers to practical part of the research, which includes methodology and detailed descriptions of implemented thematic days (activities). The aim of the study was to examine whether there were differences in observation skills depending on the chronological age of children and to determine the impact of observation on language expression. For the purpose of the research, four thematic days were implemented in a mixed kindergarten group. The study was conducted on a sample of 31 children aged 4 to 7 years. The four chosen themed days were International Children's Book Day, World Sun Day, World Migratory Bird Day and International Family Day. Each of the thematic days is designed according to a template with 3 main parts - motivational story, observing objects and creative activity. Observation activities were extended by walks in the days that thematically allowed it. After a detailed description of implemented thematic days, the analysis of the results was made and a comparison between results and the hypotheses initially set was made. At the end of the paper there is a summary of all the above in the chapter of the conclusion, along with personal opinions, attitudes and impressions.