众所周知妊娠期羊水量的多少对胎儿预后能产生恶劣的影响。羊水过少时胎儿与妊娠周数相比发育迟缓及肾缺如,尿路闭塞等畸型。肾及尿路的异常使胎儿的尿量减少,是导致羊水过少的原因。羊水过多时的畸型多为脊柱裂、无脑儿、上消化道闭塞,产生羊水过多的原因与吸收吞咽羊水功能障碍有关;另外母体患糖尿病时由于渗透压利尿作用 As we all know, how much of the amount of amniotic fluid during pregnancy can have a bad prognosis. Oligohydramnios and gestational age compared with fetal growth retardation and lack of kidney, urinary tract obstruction and other abnormalities. Abnormal renal and urinary tract so that the baby’s urine output is reduced, leading to oligohydramnios reasons. Amniotic fluid abnormalities are mostly spina bifida, no brain children, upper gastrointestinal occlusion, the cause of excessive amniotic fluid absorption and swallowing amniotic fluid dysfunction; the other due to the mother of diabetes due to osmotic pressure diuretic effect