The amniotic fluid index of women in late pregnancy is usually between 80-180mm. In late pregnancy, the space occupied by the fetus in the uterus increases and the amount of amniotic fluid will decrease accordingly. If the amniotic fluid index is less than 50 mm, beware that it is too little amniotic fluid with intrauterine hypoxia of the fetus, and fetal heart monitoring can be done. If the amniotic fluid is more than 210mm, you should be examined to rule out chromosomal abnormalities and other congenital diseases. When the amniotic fluid is too small, you need to drink more water or take regular supplements of soy milk or drinks to replenish the amniotic fluid quickly. Develop a good work and rest schedule during late pregnancy, get enough sleep and don’t stay up late too often. It is also necessary to prohibit sexual intercourse in the late pregnancy to avoid affecting the development of the fetus, otherwise it may also cause premature birth and other conditions.