Many pregnant women are very worried when they find cloudy amniotic fluid during ultrasound examination in late pregnancy. The cloudy amniotic fluid does not necessarily affect the fetus, but it is important to observe the normal fetal movement and to do regular maternity checkups and fetal heart monitoring to detect fetal abnormalities in time. In case of amniotic fluid and fecal contamination, continuous electronic fetal heart monitoring is recommended. If the fetal heart monitoring is normal, no special treatment is needed; if the fetal heart monitoring is abnormal, there is intrauterine hypoxia, which can cause fetal fecal aspiration syndrome, resulting in adverse fetal outcome. With the increasing resolution of ultrasound instruments, scattered floating particles can often be seen suspended in the amniotic fluid during ultrasound examination, especially when the fetus is active, with the appearance of a blizzard. As the fetus quietens down, the suspended particles gradually settle, called free suspended particles, also known as amniotic fluid turbidity. There are two general reasons for cloudy amniotic fluid: 1) formation of fetal lipids or brittle hairs, which is not clinically significant; 2) contamination of amniotic fluid with meconium, although intrauterine distress can induce fetal discharge of meconium, but the main reason affecting meconium discharge is related to the week of gestation. The higher the gestational week, the higher the chance of amniotic fluid and fetal fecal contamination, and certain high-risk factors may also increase the chance of fetal fecal excretion, such as cholestasis of pregnancy, which can occur in 10%-20% of pregnant women during delivery, and intrauterine distress cannot be diagnosed based on amniotic fluid and fetal fecal contamination alone.