An amniotic fluid index of 6.9 centimeters is normal for a 36-week pregnant woman. The normal amniotic fluid index for a pregnant woman is between 5 and 25 centimeters, so 6.9 centimeters of amniotic fluid is normal. Amniotic fluid index is one of the more important indicators in late pregnancy. If the amniotic fluid index is greater than or equal to 25 centimeters, it is too much amniotic fluid; if the amniotic fluid is just less than or equal to 5 centimeters, it is too little amniotic fluid. Amniotic fluid can protect the fetus, with the role of relieving external pressure, but also allows the fetus to move freely in the uterus, to avoid the fetus and the uterus adhesion, and a certain degree of thermal insulation, to avoid the fetus cold. Therefore, in the late stages of pregnancy, it is recommended that pregnant women need to pay close attention to their amniotic fluid changes. Pregnant women during pregnancy should pay attention to do a good job of prenatal checkups, actively listen to the advice of professional doctors to do a good job of comprehensive care and health care, pay attention to more rest, at the same time, should relax, to avoid nervousness, anxiety, there is any discomfort should be timely to the hospital, by the doctor to clarify the diagnosis, and cooperate with the doctor to deal with the symptoms.