胎儿生长受限（fetal growth restriction，FGR）是指由于各种因素导致胎儿未达到其遗传生长潜能，是导致围产儿死亡及其他不良结局的重要原因。通过超声评估胎儿生长发育情况和寻找FGR相关高危因素是诊断FGR的重要前提。而临床诊断FGR后根据病因（尤其是是否伴结构畸形）、发病时间对其进行分类，对评估FGR胎儿预后具有重要的临床意义，有助于为后续的临床管理提供依据，从而降低母胎不良结局的发生风险。

Fetal growth restriction（FGR）means that the fetus does not reach its biological growth potential due to impaired placental function caused by a variety of factors.FGR is one of important causes of perinatal death and other adverse outcomes.Ultrasound evaluation of fetal growth and development is crucial for clinical diagnosis of FGR.Once FGR is diagnosed during the pregnancy，the classification should be performed based on the time of onset and the potential etiology（especially structural abnormalities）since they are closely associated with the prognosis.This helps to provide better clinical treatment and management and to reduce the risk of adverse maternal and fetal outcomes.