Nuchal cord occurs because the fetus moves frequently within the uterine cavity, which can result in the umbilical cord looping around the neck once, referred to as a single-loop nuchal cord. In fact, it is not correctable because it is impossible to physically reach the umbilical cord or the fetus during pregnancy. Moreover, a single-loop nuchal cord is quite common, occurring in about one-fifth of all pregnancies. If the loop is loose or the umbilical cord is sufficiently long, there is generally no significant impact on the baby. However, if the loop is tight, it can pull on the umbilical cord, causing the blood vessels within the cord to narrow. This may lead to noticeable changes in fetal movements and heart rate. Therefore, with a nuchal cord, it is important to enhance monitoring and pay attention to changes in fetal movements and heart rate.