The aim of this thesis is to present the Helen Doron Early English method of teaching English to children aged from three and a half months to nineteen years of age. The thesis is divided into two parts. The first part of the paper contains a theoretical overview of methods, methodologists, psychologists, teachers and educational experts such as S. Suzuki, M. Montessori, G. Lozanov or G. Doman, who greatly influenced the creation of the Helen Doron Early English method. Also, the first part describes in detail the HDEE method itself and all its characteristics and specifics that distinguish it from other methods. Brain development is explained, how language acquisition works, the benefits of bilingualism, and why traditional foreign language acquisition is not so successful. All types of courses (depending on age) that the HDEE method offers are listed. The thesis mentions the Croatian context of early foreign language learning and the results of research by Croatian methodologists and linguists on early language learning. The second part of the thesis presents and discusses the results of observation and teaching in Helen Doron Early English schools. Four lessons covering different age groups are described. These groups range from new-borns to adolescents. Along with the course itself, the methodology is explained, and teachers and children are described during the performance, participation or listening to classes. Besides, the teaching held in HDEE schools and classrooms is described, including a completely new aspect of