The present study analyses the emotional expression of children in the preschool context. Students of preschool education observed 70 children in preschool institutions from various Slovenian regions. The children expressed different emotions in terms of their valence and complexity, with joy being the most frequently expressed emotion (f = 96% or 92%), followed by anger (f = 48% or 49%). No significant differences in the frequency of emotion expression (for all emotions, and for joy and anger specifically) were confirmed between toddlerhood and early childhood or between boys and girls, nor were there significant differences with regard to either the valence or the complexity of the emotions. The children's joy and anger were triggered in various situations, with joy being predominantly evident during the children's involvement with activities such as play, and anger predominantly surfacing when something of the child's was taken away by another person.