Can the umbilical cord unwrap itself after it has wrapped around the neck and entered the pelvis?

Written by Du Rui Xia
Obstetrics
Updated on September 18, 2024
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When the fetus has already engaged and there is nuchal cord occurrence, it is generally unlikely for the wrapping to unwind again. This is because once the fetus has engaged, the fetal position is fixed, and the fetus will no longer change its position, making the nuchal cord a more fixed condition. When dealing with nuchal cord, it is important to observe the number of loops and whether the tightness of the loops could impact the fetus. Therefore, it is necessary to regularly attend prenatal appointments at the hospital to monitor its developmental condition. If the nuchal cord loops just once around the neck, it usually does not affect the baby.

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Written by Du Rui Xia
Obstetrics
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The difference between U-shaped and W-shaped nuchal cords.

During pregnancy, through ultrasound examination, if echoes of the umbilical cord are found around the fetus’s neck in U-shaped or W-shaped patterns, this indicates the presence of nuchal cord. The difference between U-shape and W-shape primarily lies in the number of wraps around the neck. A U-shaped notch indicates the umbilical cord is wrapped around the neck once; a W-shape indicates it is wrapped twice. When nuchal cord is present, there is no need to be overly anxious; regular prenatal check-ups can be conducted at the hospital to monitor the development of the nuchal cord and the safety of the fetus inside the uterus.

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Written by Zhang Lu
Obstetrics
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Is it dangerous for the umbilical cord to be wrapped around the neck during the mid-stage of pregnancy?

During a mid-pregnancy ultrasound, it is sometimes indicated by the presence of a U-shaped or W-shaped notch behind the fetus's neck that the fetus may have the umbilical cord wrapped around its neck. During pregnancy, it is perfectly normal for the umbilical cord to wrap around the neck, and it generally does not affect the fetus or pose any danger. The length of the umbilical cord during pregnancy is approximately 30 to 80 centimeters, which is quite long relative to the size of the uterine cavity. Hence, many umbilical cords have excess length that can wrap around the neck or limbs of the fetus, leading to the umbilical cord being coiled around the neck or limbs. However, current research indicates that whether the umbilical cord is wrapped around the neck or limbs once or twice, it does not affect the fetus. It does not cause intrauterine hypoxia or affect the growth and development of the fetus, nor does it influence the mode of delivery. A natural childbirth can still be an entirely viable option.

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Written by Zhao Su Min
Obstetrics
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How to correct the umbilical cord wrapped around the neck once?

The umbilical cord is wrapped around the neck once, and there is no way to correct it; it cannot be rectified by changing position or through medication. The umbilical cord being wrapped around the neck once can be due to the umbilical cord being relatively long, or the fetus having a large range of movement within the womb. During pregnancy, as the fetal movements change, it might wrap around twice or even three times, although it's also possible that there will be no wrapping of the umbilical cord around the neck by the end. There is no need to panic if the umbilical cord is wrapped around the neck once. Pay attention to fetal movements and attend regular prenatal check-ups. If there is an increase or decrease in fetal movements, it is important to visit the hospital promptly to have an ultrasound, listen to the fetal heartbeat, and check for any signs of fetal hypoxia. If fetal hypoxia is present, oxygen therapy should be administered, and pregnancy termination may be necessary if required.

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Written by Du Rui Xia
Obstetrics
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Can nuchal cord be corrected by lying prone?

Nuchal cord refers to a condition during pregnancy where the umbilical cord wraps around the fetus's neck or abdomen due to the baby's continuous movements and changes in position. Lying prone cannot correct a nuchal cord because the fetus can move freely within the womb. In some cases, the baby may even resolve the issue through its movements, so there is no need for excessive worry. It is only necessary to visit the hospital regularly for prenatal check-ups, follow the doctor's advice, and monitor the fetal heart rate. Generally, this does not cause any adverse effects.

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Written by Liu Wen Li
Obstetrics
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Can you have a natural birth if the umbilical cord is wrapped around the neck twice?

The umbilical cord wrapped around the neck twice is something that can definitely be attempted, meaning a trial of natural delivery, or vaginal trial. Clinically, there have been many cases where the umbilical cord was wrapped around the neck twice, and the baby was delivered smoothly. Therefore, it's unnecessary to avoid a trial of delivery and opt for cesarean section just because the umbilical cord is wrapped around twice; that would be somewhat excessive. Of course, when the cord is wrapped around the neck twice, since the wrap is relatively tight, the remaining length of the cord might be short, and when the baby's head moves downward, there could be changes in the fetal heart rate, but not necessarily in all cases. Therefore, for pregnant women with the umbilical cord wrapped around the neck twice, doctors will closely monitor changes in the fetal heart rate during the delivery process.