据专家统计,怀孕时期,男女胎儿的比例是115～130比100,似乎自然界早知男性将活在一个不利他们的环境之中,所以在怀孕胎儿上男性占多数,但许多男性胎儿会自然流产。出生时,男婴依然占有数目上的优势,是105对100,可惜,男婴的首岁死亡率较女婴高 According to expert statistics, during pregnancy, the proportion of male and female fetuses is 115-130 than 100, it seems that men in the past will know that nature will have a negative impact on their environment, so the majority of male fetuses in a pregnant fetus, but many male fetuses will spontaneous abortion . At birth, the number of baby boys still occupies the number advantage of 105 to 100. Unfortunately, the first year old male infant mortality rate is higher than that of female high