The purpose of this study finds that (1) history of the First birthday rite(첫돌 의례) and (2) changing process of the First birthday`s dress and ornaments(첫돌 복식). The results of this study are as follows. The history of the first birthday rite has been continued vary long years in Korea, but it`s origin is not clearness. The purpose and form of the first birthday rite are vary similarity in China and Korea. The rate of infant mortality was regarded that an absolute element of the first birthday rite. Making process of the first birthday`s dress and ornaments was not definite, The adoption of that`s form and elements act on affect local·homely·individual situation. First birthday`s dress and ornaments was changed by changing process and convert of recognition about First birthday rite. It shows that the change of rites clothing contacted with changing process of rites.