Followed the innovations in the theories of learning put forward by Piaget and Vygotsky, this study was seeking to scrutinize and analyze their theories with respect to English literacy in a child as a case study, while watching cartoons. To this end, a case study was conducted on a child for more than three and a half years. The study was done in two phases: During the first phase, the child `s language behavior was observed carefully, and during the second phase the child was put under experiment in ZPD and non-ZPD situations. The results of both the longitudinal study and microgenetic analysis of the child-parent L2 co-construction demonstrated gradual self-regulation using the L2, while watching cartoons. Moreover, the results have been more compatible with Vygotsky`s theories than with those of Piaget on learning. Finally, some conclusions were made and some implications were provided for parents and practitioners in EFL contexts.

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