Purpose: The aim of this study to evaluate the feasibility and the adventages of one stage transanal endorectal pull-through (TEPT) procedure in patient with Hirschsprunq's disease under three months of age. Materials and methods: 170 patients less than three months of age underwent TEPT for Hirschsprunq's disease between July 2002 and Septemper 2004 in Children hospital No.1.