As the fetus increases in gestational weeks and the digestive system matures, it can discharge meconium in the uterus. Discharge of meconium in the amniotic fluid can also occur if the fetus suffers from intrauterine hypoxia, aging of the placenta, and so on. Amniotic fluid with meconium inside is amniotic fluid meconium contamination, which means that the fetus discharges meconium in the uterus, resulting in amniotic fluid contamination. It can be a physiological manifestation, and amniotic fluid contamination may occur due to the fact that the larger the gestational week, the digestive function of the fetus can defecate. Some other pathological factors under the influence of intrauterine oxygen deprivation of the fetus and relaxation of the anal sphincter can also discharge feces, such as gestational hypertension, placenta previa, prolonged labor, and so on. In addition, the aging of placental function can also occur with meconium in the amniotic fluid.