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足月出生男婴平均体重较女婴多50～150g以及身高0.5～1 cm,一岁时此两者差异增至0.5kg和1～2 cm,相反在早产婴儿中,两性体重差别,只能在足月前最后8～12周可测知。鉴于上述胎儿性别之大小差异设想可能由内分泌所决定,为建立正常胎儿生长数据表,本研究采用超声波(Nuclear Enterprises Diasonograph NE 4102)扫描对101例月经周期正常孕妇进行研究。于妊娠7～13周每两周测量胎儿顶臀长度共2～4次,12周至足
The average weight of full-term born baby boy is 50-150g more than that of female infant, and the height is 0.5-1cm. At one year old, the difference between the two is increased to 0.5kg and 1-2cm. On the contrary, in premature infant, the difference between male and female body weight can only be In the last 8-12 weeks before full-term measurable. In view of the above hypothesis that the size of fetal sex difference may be determined by the endocrine, in order to establish a normal fetal growth data table, this study used ultrasound (Nuclear Enterprises Diasonograph NE 4102) scan of 101 cases of pregnant women with normal menstrual cycles. 7 to 13 weeks of pregnancy measured every two weeks fetal top hip length of a total of 2 to 4 times, 12 weeks to foot