Abstract—Piaget’s theory, which is at the center of cognitive approach and major theoretical foundation in
terms of the intelligent development, explains children’s language learning by using four stages of cognitive
development. For instance, Piaget maintains that Egocentrism is related to language learning as an inner
speech and can affect on differentiation in cognitive development. This paper is to focus on the important
educational foundation and information, which can prove how Language Egocentrism (LE) and Language
Differentiation (LD) have an influence on native and second language acquisition for young children (two to
seven years old), and what characteristics can be included in the subcategories of LE and LD.