Fetal hiccups can be used to determine intrauterine hypoxia. As the living standards of pregnant women improve, people are becoming more and more aware of fetal health. By observing fetal hiccups, the intrauterine hypoxia of the fetus can be indirectly determined. The following is a detailed explanation from four aspects. The first aspect: Development of the fetal respiratory system The fetal respiratory system in the womb is relatively weak. The fetal body cannot adapt to lower oxygen concentrations like adults. At the same time, the fetus itself exchanges gas through the umbilical cord. When the fetus is affected by factors such as hypoxia, the fetal respiratory system will have abnormalities, among which the most common and most susceptible