我院产科门诊自1983年3月至8月在产前检查孕妇中,对孕28周至孕42周者2000余例,超声测量胎头双顶径,以估计胎儿宫内生长情况。经统计学计算,各孕周胎头双顶径百分位数如表1,各孕周胎头双顶径百分位数曲线如图1。我们在临床中观察到,凡各孕周超声胎头双顶径在该孕周胎头双顶径第10百分位数 Obstetrics and Gynecology clinic in our hospital from March 1983 to August in prenatal examination of pregnant women, pregnant 28 weeks to 42 weeks of pregnancy were more than 2000 cases, ultrasound measured fetal head biparietal diameter to estimate intrauterine growth. Calculated by statistics, each gestational week biparietal diameter percentile as shown in Table 1, gestational weeks biparietal diameter percentile curve shown in Figure 1. We observed in the clinic, where the gestational age ultrasound fetal head biparietal diameter in the gestational week biparietal diameter tenth percentile