The amniotic fluid of 30mm depends on whether it refers to the maximum dark area of amniotic fluid or the amniotic fluid index. If the maximum dark area of amniotic fluid is 30mm, it is normal. If the amniotic fluid index is 30mm, then the amniotic fluid is too low. In the diagnosis of amniotic fluid volume, the amniotic fluid index is the sum of the four quadrants of the ultrasound, and less than 50 mm is considered to be too little amniotic fluid. If the maximum dark area of the amniotic fluid is measured, the maximum dark area of the amniotic fluid less than 20mm is considered too little amniotic fluid. If the amniotic fluid is low, you should go to the hospital and ask the doctor to evaluate the cause of the low amniotic fluid, whether there is placental hypoplasia and fetal hypoxia, if there is placental hypoplasia and fetal hypoxia, the pregnancy should be terminated in time.