Methods: (1) Study of the relationship between ultrasonic measurements of fetal biparietal diameter (BPD), cerebellar diameter (CD), femur length (FL) and abdominal circumference (AC) and neonatal birthweight in 300 cases.

• 方法：（1）应用B型超声对300例胎儿的腹围、小脑横径、双顶径、股骨长进行测量，并与新生儿出生体重的关系进行分析。 经单元线性回归得出腹围预测胎儿体重的单元方程式。