尿的,也喝的。。宝宝4个月后肾脏发育好了就开始往羊水尿尿了 http://www.pennmedicine.org/encyclopedia/em_DisplayAnimation.as “Amniotic fluid is 98% water and 2% salts and cells from the baby. Until the fetal kidneys started working during month four, amniotic fluid is made by the mother’s body. But after month 4, the little guy started to make his contribution to the amniotic fluid by urinating into it. You heard right. It may not sound appealing to us, but the urine in the amniotic sac is completely harmless to the baby.”