胎儿是决定分娩三因素之一,而胎头的大小是胎儿能否顺利通过产道的重要条件,因此研究足月分娩新生儿头径的生理常数,在产科工作中是有着重要意义的。1956年柯应夔等曾进行过中国成熟胎头1000例的研究,但因我国是个幅员辽阔、民族众多的国家,且因地区、营养、种族、生活习惯的不同,也会反映在儿头的大小的差异上,因 The fetus is one of the three factors that determine childbirth. However, the size of the fetal head is an important condition for the fetus to pass through the birth canal smoothly. Therefore, it is of great significance to study the physiological parameters of the neonatal head of full-term labor in obstetric work. In 1956, Ke Yingtao et al. Conducted a study of 1000 cases of mature fetal head in China. However, China is a country with a vast territory and many ethnic groups and will also be reflected in the differences in areas, nutrition, ethnicity and living habits The difference between the size, because