Every preschool age child in Finland has the right to child care. Well-educated staff consists of all-round experts who work in versatile contexts with various children in a multi-professional collaboration. This staff is one of the strengths of the Finnish child care system. The aim of this article is to clarify the expertise of those early childhood education teachers, who have the competence of kindergarten teachers (n = 80) and discuss how the development of early childhood education teachers' expertise could be supported in a small country like Finland, and more specifically, in its northernmost part, the province of Lapland. This was a qualitative study. The data consisted of the early educators' stories of their growth toward expertise. The analysis method was content analysis. Four themes emerged from the analysis of the early educators' growth toward expertise. According to the informants, education, work experience, personal life history and personal attitudes toward work had been the most influential variables in the process of growth toward their expertise. This research showed that the development of early childhood education teachers' expertise necessitates new kinds of working methods and measures for educational planning. In addition, there is need for individual development plans as the work has become more and more collegial and it is necessary to expand a notion of individual expertise into the realm of collaborative and socially shared expertise. (author abstract)