Br Sembiring, F.E.D.R., Rusdi Noor Rosa and Br. Perangin-Angin, A. 2025. Exploring Izzi’s First Language Acquisition: A Case Study of a Five-Year-Old Child. JADEs Journal of Academia in English Education. 5, 2 (Jan. 2025), 317-329. DOI:https://doi.org/10.32505/jades.v5i2.8775.