Abstract: Language is a key factor and a critical resource in all human engagements especially in the teaching-learning process. Language is functional in the preservation of a people`s cultural heritage, a community`s vehicle of verbal communication and medium of instruction among others. This study discusses the danger of using foreign language as medium of instruction for the Nigerian child too early and weaning them on the mother tongue too early. Such a situation will tantamount to alienating the Nigerian child from his mother tongue and the indigenous culture. The study therefore argues on why Nigerian indigenous languages should be compulsorily made the media of instruction in the primary school and other levels of education.