This paper reviews current work on child second language acquisition from a generative perspective. The primary goal is to identify characteristics of child L2 acquisition in relation to child first language (L1) acquisition and adult second language (L2) acquisition and to discuss its contribution to these sister fields both in typical and atypical domains. The paper is organized into three sections, covering L1 influence in child L2 acquisition, the acquisition of functional architecture in child L2 acquisition, and the issue of morphological variability. Also included in the last section are the relatively new and fast developing areas of research in atypical child L2 acquisition research.