What is your baby’s umbilical cord?
The umbilical cord begins to form around 4 weeks of pregnancy. It’s your baby’s lifeline to the placenta, the pancake-shaped organ that’s attached to your uterus.
The umbilical cord delivers vital nutrients from your body to your baby and transports the waste your baby produces. It has three blood vessels: one vein that carries nutrients and oxygen-rich blood from your circulatory system to your baby, and two arteries that return waste and oxygen-depleted blood to you.
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Your kidneys process your baby’s waste along with your own for disposal, and your lungs replenish the blood with oxygen.
What is the umbilical cord attached to?
The umbilical cord is attached to both you and your growing baby – to the placenta at one end and the baby’s belly (which will eventually become the belly button) at the other end.
Surprisingly thick and tough, the umbilical cord usually grows to about 22 inches long and 1 inch in diameter.
Cutting the umbilical cord
Soon after your baby is born, it’s time to clamp and cut the cord. Your partner or support person can cut the ribbon if they wish. Some moms also choose to cut the umbilical cord themselves: “I want to cut mine with my husband,” she says BabyCenter Community a member of Doctorbebe.
First, your healthcare provider uses two special clamps to close the umbilical cord and stop the blood flow, usually in two places about an inch apart. It takes some effort to cut the thick, rope-like cord, but don’t worry: there are no nerves in the umbilical cord, so this procedure is painless for your baby (and you).
My husband managed to cut the umbilical cord. Every time was a wonderful experience!
– BabyCenter community member JEMc1021
Delayed cable clamping
Traditionally, practitioners in the United States cut a baby’s umbilical cord almost immediately after birth, but research shows that delayed cord clamping has health benefits, especially if your baby was born prematurely.
Waiting to clamp the umbilical cord allows blood from the umbilical cord to continue to flow to your baby, reducing the risk of newborn anemia and iron deficiency in infants.
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“I was able to hold my babies on my chest right away during delayed cord clamping,” he says. BabyCenter Community member JEMc1021. “My husband was then able to cut the umbilical cord. It was a beautiful experience every time!”
When does the umbilical cord fall off?
After the umbilical cord is cut, a small cord stump remains. This piece of tissue eventually dries up and falls off, usually in one to three weeks. Until it does, you’ll need to take care of the cord stump by keeping it clean and dry.
“My baby fell out at about two weeks,” he says BabyCenter Community Member Boymom003. “But it’s still bleeding a bit, so we’re taking precautions and keeping it clean. But every baby is different – it just needs time to dry.”
Of course, your baby will forever carry a small remnant of the time he spent attached to you: his belly button!
You have no control over whether your baby ends up with an innie or an outie. What your baby’s belly button looks like depends on how the umbilical cord was attached to your baby’s belly during pregnancy and can change over time as your child grows.
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Cord blood bank
You might consider banking your baby’s cord blood. Cord blood contains stem cells that can grow into different types of body cells and are used to treat certain diseases, including some cancers and blood disorders.
For an annual fee (plus the cost of collecting cord blood), you can store some of your baby’s cord blood in a private bank for future use.
Or you can donate your baby’s cord blood to a public bank, where it remains available to anyone who needs it and matches your baby’s blood type.
“Leading healthcare organizations usually recommends public cord blood banking over private banking,” says Liz Donner, MD, a pediatric hospitalist and member of BabyCenter’s medical advisory board. “Private cord blood is relatively underutilized, lacks regulatory oversight, and is expensive for the family and potentially of lower quality (in terms of number and quality of stem cells) than those stored in public cord blood banks. It is important to understand the difference when choosing whether either option is right for your family and you should never feel pressured to buy cord blood in general.”
Keep in mind that you will need to decide what you want to do long before your baby is born so that you can make all the necessary arrangements
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Here’s a summary of everything you need to know about cord blood banking.
Umbilical cord abnormalities
During pregnancy and childbirth, some conditions can occur that affect the umbilical cord. In most cases, they go away on their own and do not harm your baby. Some, however, can be serious.
“Umbilical cord abnormalities that persist or occur during labor can be a life-threatening emergency,” says Dr. Donner. “That’s why access to prenatal care and prompt medical intervention after birth is so important to me personally.”
The most common umbilical cord conditions include the following:
Nuchal cord
The umbilical cord may be wrapped around the baby’s neck during delivery. This condition, called nuchal cord, is not uncommon and occurs in 10 to 29% of pregnancies.
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In most cases, the umbilical cord simply separates from the baby’s neck when the head comes out, and the birth proceeds normally. But if the cord is wrapped very tightly, your health care provider may need to clamp it and cut it before the baby’s shoulders are born.
Umbilical cord compression
Umbilical cord compression occurs when the umbilical cord tightens, cutting off the baby’s oxygen supply. The umbilical cord may have become tangled or tangled, which can happen if it is unusually long or if the baby’s head presses on it during labor.
Umbilical cord compression can usually be detected during labor by changes in the baby’s heart rate. A technique called amnioinfusion, in which fluid is injected into the uterus through a thin tube, can help take pressure off the umbilical cord and allow for a normal birth.
Umbilical cord prolapse
This is a serious complication in childbirth: umbilical cord prolapse means that the umbilical cord comes out of the vagina as the baby’s head is being born, which can cut off the blood supply to the baby. In such cases, an emergency caesarean section is usually performed.
One umbilical artery
A very small number of babies have only one umbilical artery instead of two. This condition is more common when you are carrying twins or multiples.
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Having only one umbilical artery can cause problems with the baby’s digestive organs, kidneys and heart. If you are diagnosed with this condition during pregnancy, you will have special tests to monitor your baby’s health along the way.
“You’ll find that with SUA (single umbilical artery), the doctor will ask for a sonogram every month,” he says BabyCenter Community member jenragan35, whose baby was diagnosed with the condition. “At least you get to see your baby more than others. It’s fun! They’ll probably send you to a specialist, too.”
Umbilical cord cysts
Umbilical cord cysts are pockets of fluid that form in the umbilical cord. One type, called a true cyst, is harmless and often goes away on its own before the baby is born. It is usually detected during an ultrasound in the first trimester.
However, cysts found later in pregnancy may indicate a genetic condition or another problem. If this type of cyst is found, your doctor will likely recommend a detailed ultrasound and genetic testing.
Velamentous cord insertion
Velamentous insertion of the umbilical cord and marginal insertion of the umbilical cord mean that the umbilical cord is attached to the amniotic membrane or the side of the placenta instead of going straight to the center of the placenta.
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This leaves the vessels of the umbilical cord more exposed than they would be if they were attached directly to the placenta, where they would be protected by a gel-like substance called Wharton’s jelly.
Vasa previa
In vasa previa, some of the fetal blood vessels are exposed and pass through the cervical opening, instead of being contained within the umbilical cord.
When contractions occur, these blood vessels stretch and can rupture, resulting in fetal blood loss and fetal distress. This is a very serious condition and may require prolonged hospital follow-up.
Key Takeaways
- Your baby’s umbilical cord delivers vital nutrients from your body to your baby and removes the waste your baby produces.
- The umbilical cord is attached to your placenta at one end and to your baby’s stomach at the other.
- When the umbilical cord is removed after birth, it leaves behind a stump that will fall off in one to three weeks – leaving behind your baby’s belly button!
- Sometimes umbilical cord anomalies occur during pregnancy and childbirth. They are usually not dangerous and go away on their own, but some can be serious and require immediate treatment.