This paper focuses on mirroring as an intervention in language development and, through reconfirmation of its definitions and an overview of studies on approximate concepts, examines effects of the mirroring. The mirroring is defined as becoming synchronized with emotional conditions of infants and reflecting them like a mirror. This is considered to serve an important role in encouraging infants to increase their self-awareness by functions of giving feedback, controlling emotions, maintaining communication, and sharing feelings. During language development of a child, imitation by his/her mother plays a role in enhancing the child’s understanding of language and nurturing his/her sociality. The mirroring is always accompanied by the mother’s behavior for attracting the child’s attention. As preceding studies show, for drawing attention of young infants, more salient behavior is needed. The above-mentioned knowledge suggests that in order to make the mirroring more effective it is necessary to give guidance to attract children’s attention as well as recommending the mirroring itself. Therefore, further study on a role of the attention-attracting behavior in the mirroring is expected.