Small for gestational age（SGA） is a group of heterogeneous diseases，and technical advances in gene detection provide the opportunity for its precision diagnosis. With deepening understanding of SGA，clinicians recognize a poor fetal growth as well as post－natal adverse growth modes have adverse effects on the short-term and long-term health outcomes. Therefore，we outline the manage－ment priorities and strategies in different periods of SGA to provide basics for the realization of lifelong management.