Language is a complex and subject to constant change because it is made up of different speakers living in a changing world. However, the language is so adaptable that it accepts any change. It is the most dominant means of communication between people, and knowledge of the language is very significant to transfer it with ease to the young. Thus, one of the most important processes in human life is precisely the acquisition of language, which begins in the mother's womb while newborns listen to speech, especially the mothers. Therefore, this thesis explored one part of language acquisition, and that is voice changes. Namely, the foundations of voice changes are set in primary school, and then supplemented with various examples and fundamental facts. The aim of this paper is to analyze and compare the adoption of voice changes in the younger school age among students of various age groups. For the purposes of the paper, a survey was conducted with multiple examples for the implementation of voice changes. Thirty respondents aged seven and nine took part in the research, and the adoption of several voice changes was noticed. The success of the solution showed that children aged seven and nine still have difficulty making voice changes. Namely, children typically learn morphophonologically easier and simpler words, i.e. words in which no voice changes are made.