The aim of this paper is to prove that starting learning a second language at an early age does not have any disadvantages; on the contrary, concerning the linguistic improvement of a child, only advantages can accrue of it. Furthermore, I wish to describe the principles and the methodology of the HDEE method which contribute to this linguistic improvement. Factors, such as age, brain and its work, motivation, personality factors and cognitive style of the learner that influence the success of second language acquisition will also be mentioned.