The main focus of this paper is to provide an overview of theories and hypotheses that are related with children’s language acquisition, i.e. the process of primary language acquisition, and to connect them with feral children that have been born or brought up in isolation, without any contact with human language. Since children’s language acquisition has not been fully investigated till the present days, the main goal of this paper is to familiarize the reader with theories that explain all the ways in which children acquire language, develop their vocabulary and apply all the linguistic rules they have learned in order to achieve linguistic performance. Also, this paper focuses on feral children, enlisting all their major characteristics, some of which rely on myths and some were scientifically proved. Furthermore, this paper is concentrated on Genie, a feral girl who has been integrated into society at the age of 13 and her linguisitic development has been thouroughly investigated by scientist. In an attempt to present this issue with clarity, this paper is divided into two major sections that have then been subdivided. These major sections include the overall view and notions on children’s language acquisition, whereas the second section is mostly focused on feral children in general and Genie’s linguistic development. The introduction offers basic characteristics of this paper. In the following main body part, the reader is presented with theories and hypotheses related to children’s primary language development and examples of feral children. Lastly, this paper contains conclusion which summarises all its most relevant parts.