宫内生长迟缓指新生儿体重低于正常值的第10百分位数,或低于平均值的2个标准差或足月时体重低于2500克者。Carrera报导在8,990次分娩中,有164例宫内生长迟缓,发生率为1.82%,通常的发生率为2～3%。这类新生儿的死亡率较正常体重者高6～8倍。一、病因约有40%发生于表面上正常的妊娠。30～40%发生于妊娠合并妊毒症、肾病或系统性疾病如红斑狼疮等。10%由于多胎;10%由于先天畸形或胎儿感染。 Intrauterine growth retardation refers to the tenth percentile of neonates weighed below normal, or two standard deviations below the mean or at less than 2500 grams at term. Carrera reported 164 intrauterine growth retardations in 8,990 deliveries, with an incidence of 1.82% and a usual incidence of 2-3%. The death rate of these newborns than normal weight 6 to 8 times higher. First, the cause of about 40% occurred in the surface of normal pregnancy. 30 ~ 40% occurred in pregnancy complicated with pregnancy, kidney disease or systemic diseases such as lupus. 10% due to multiple births; 10% due to congenital malformations or fetal infections.