The preschool period is significant in language acquisition and speech development in children. Speech-language development begins even before the child's first word. By responding to the child’s needs, we develop a sense of attachment that affects the child’s later speech. Vocabulary enrichment and development evolves throughout the entire life. In the period between the age of one year and a half to two, there is an abrupt increase in the number of words in the child's vocabulary because the child does not learn words but rather adopts them unconsciously and automatically. The aim of this paper was to determine whether children will adopt a certain set of adjectives through certain activities and incentives, whether their vocabulary will expand in a certain period of time, and whether gender influences vocabulary expansion. The research with children for the purposes of this paper was conducted in the Grigor Vitez Kindergarten. The results of the research showed that the children adopted a certain set of adjectives through daily and targeted activities of reading picture books, singing, and playing various language games. Additionally, it has been shown that gender does not affect vocabulary enrichment although girls are more motivated and more creative than boys. In conclusion, the richness and quality of a child’s vocabulary depends on a quality speech model. The kindergarten teacher is the one who provides love, understanding, a sense of safety and prepares a stimulating environment for the overall development of the child. By asking stimulating questions and encouraging research, the teacher incites children's curiosity, which then results in good speech and language development.