The maximum depth of amniotic fluid at 29 weeks of pregnancy is usually 2-8cm and the amniotic fluid index is usually between 5-25cm, but there is some margin of error. At 29 weeks of pregnancy, which is a late stage of pregnancy, if the depth of amniotic fluid is less than 2cm and the amniotic fluid index is less than 5cm, it is considered to be too little amniotic fluid. When the amniotic fluid is too small, it will not only lead to the fetus survival space limitation and activity restriction, but also easy to have intrauterine oxygen deficiency and fetal distress. If the depth of amniotic fluid is more than 8cm and the amniotic fluid index is more than 25cm, then it is considered excessive amniotic fluid. Excessive amniotic fluid may lead to preterm labor, premature rupture of membranes, umbilical cord prolapse and other risks. With the elevation of the uterine fundus, pregnant women may also experience diaphragm uplift and compression of the lungs, resulting in respiratory distress and wheezing, and other symptoms. As a result, pregnant women should have regular ultrasound reviews during pregnancy and closely monitor the amount of amniotic fluid to avoid the risks mentioned above.