Amniotic fluid index of 8-25cm in the middle and late stages of pregnancy is a normal range, and in the case of a single pool of amniotic fluid, between 3-8cm, is also a normal range. In the normal range is the best, if the amniotic fluid is too much, or too little amniotic fluid, it is very harmful to the fetus. Excessive amniotic fluid is often caused by malformations in the digestive tract of the fetus or diabetes. If there is too little amniotic fluid, it is mostly seen in malformations of the urinary tract or caused by systemic diseases. Therefore, if there is too much amniotic fluid and too little amniotic fluid, it is important to find out the cause and decide on the next step depending on the duration of the pregnancy.