The purpose of the study was to understand the social bases of early language development. The findings of this study are as follows ; Firstly, the theory of Vygotsky\'s social interactionism is a significant factor in understanding the social aspect of early language development. Secondly, the speech act theory which views all utterances as a form of speech act and focuses on linguistic communications and emphasizes the appropriateness rather than utterances\'s grammatics is a more practical as well as an affective approach to study early language acquisition. Thirdly, in order to become an excellent communicator, young children must learn basic principles of communication but this process must take place naturally. Fourthly, early language development requires environmental support. Fifthly, a characteristic of early language development is that it can be facilitated by the mother\'s communication skills. Sixthly, the development of oral and written language is interrelated with young children\'s play activities. Seventhly, early language development is affected by the social and economical family environment. A study on young children\'s social environment will facilitate a basic understanding of early language development. It is my conclusion that in the future, a consolidated as well as a continuous study on emotional, perceptual, physiological and linguistic abilities of young children will be established in both theory and practice.