Every preschool teacher’s activity results in changes in the preschool teacher as well as in the practice. In situations where we have a limited number and form of professional training offered to preschool teachers, whose attendance is not always subject to the personal plan of preschool teachers’ professional development, informal learning adds great value to teacher development. This paper aims to examine the involvement of preschool teachers in certain forms of informal learning and their reflection on the impact these forms have on their professional development. The empirical part of the paper presents the results of a survey conducted among preschool teachers. 110 preschool teachers from the Republic of Croatia responded to the questionnaire and we got answers to two research questions. The results show that preschool teachers are most often involved in a form of informal learning which includes agreeing on how to work with a colleague from the group and documenting the children’s activities.Vsaka aktivnost vzgojiteljev predšolskih otrok spreminja tako posameznega vzgojitelja kot prakso v vrtcu. V razmerah, ko smo omejeni tako pri številu kot obliki strokovnih usposabljanj predšolskih vzgojiteljev, katerih udeležba v njih tudi ni vedno odvisna od osebnega načrta poklicnega razvoja vzgojiteljev v vrtcu, ima informalno učenje velik pomen za razvoj vzgojiteljev. Namen prispevka je raziskati vključenost vzgojiteljev predšolskih otrok v nekatere oblike informalnega učenja in njihov razmislek o vplivu teh oblik na njihov profesionalni razvoj. V empiričnem delu prispevka so predstavljeni rezultati ankete med 110 vzgojitelji predšolskih otrok v Republiki Hrvaški. Na podlagi vprašalnika smo dobili odgovore na dve raziskovalni vprašanji. Rezultati kažejo, da so predšolski vzgojitelji najpogosteje vključeni v informalno učenje, ki zajema dogovor o tem, kako sodelovati s kolegom iz skupine, in dokumentiranje otrokovih dejavnosti
