The umbilical cord is a flexible connection between a fetus and the placenta during pregnancy. It supports the exchange of oxygen and nutrients that the fetus needs to grow. [1][2]
After birth, the cord is no longer needed, and a short stump remains attached to your baby for a time. [3] Knowing its basic role can make this change feel less unfamiliar as you prepare to meet your baby and care for them. The key idea is simple: the cord has a job during pregnancy, then that job ends after birth.
What the cord’s role means for your baby
The cord serves as a link between the fetus and the placenta, helping support the fetus during pregnancy. [1][2] For example, oxygen and nutrients pass through this connection as the fetus grows. [2] This is why the cord matters before birth: it supports the exchange of what the fetus needs during pregnancy. [2]
The cord’s flexible, coiled structure allows it to serve as that connection. [2] You do not need to assess the cord’s shape or feel its movements to understand its role; its basic purpose is to support the exchange between fetus and placenta. [2]
After birth
Once your baby is born, the cord is no longer needed, and a short portion remains as a stump. [3] That stump is a temporary reminder of the connection your baby had with the placenta during pregnancy. [1][3]
This opening overview explains the cord’s purpose and what changes at birth; later sections cover the newborn stump and its care. If you are preparing for delivery, you can ask your care team what to expect during the transition from pregnancy to birth.
How does the umbilical cord work during pregnancy?
During pregnancy, the umbilical cord links your developing baby to the placenta and carries oxygen and nutrients to the fetus. [1] [2] That connection helps supply what your baby needs while developing in the uterus.
The cord’s route
The cord joins your baby at the abdomen and connects to the placenta, the organ that supports the pregnancy. [2] You can think of it as a transfer route: the placenta is at one end, and your baby is at the other.
The cord contains blood vessels that carry materials between the baby and placenta. [4] March of Dimes describes three vessels, including a vein; that detail helps explain why the cord is more than a simple tether. [4]
What it carries
Oxygen and nutrients move through this connection to support the fetus during pregnancy. [2] In everyday terms, the cord is part of how your baby receives what is needed to grow before birth.
For example, when you hear that the placenta supplies the baby, the cord is the link that connects the two. [1] You do not need to track the cord’s work from moment to moment; it serves as the connection throughout pregnancy.
What happens to the cord when your baby is born?
After birth, your baby no longer needs the umbilical cord, so it is cut; a short piece stays attached for a while as the stump. [3] The details of the cut may look different depending on what you see in the delivery room, but the basic change is simple: the cord’s role during pregnancy is over.
Your care team typically handles cutting the cord as part of the birth process. You may see a clamp placed on the cord before it is cut, and the remaining piece will be close to your baby’s belly. The stump is not a new connection your baby needs to keep receiving care; it is the small portion left after the cord is cut.
Some families may hear about delayed cord clamping before or during labor. This means the cord is not cut right away after birth. If you have questions about whether it will be part of your birth plan, bring them to your care team; the choice and details can be discussed with them.
Once the cord is cut, you can focus on meeting your baby while the stump remains attached temporarily. For example, when your baby is placed on your chest or wrapped for a first cuddle, that small piece may still be visible at the belly. You do not need to do anything special at the moment of birth to make the stump detach; routine stump care is a separate step after delivery.
What happens to the newborn cord stump?
The newborn cord stump dries and changes as it heals, then usually falls off within one to three weeks. [5][6] You may notice it look different from day to day; that change is part of the drying process, not a reason to expect it to look the same throughout healing.
After a couple of days, the stump can feel stiff and look dry. [5] Its appearance may shift as it dries, so a change from a softer-looking stump to a firmer, drier one can be expected. [5] The skin around the edge can also form a small bulge, which is described as a normal variation. [5]
Most stumps fall off when your baby is between one and three weeks old. [6] The practical expectation is that it will be gone by the time your baby is three weeks old. [7] For example, if it is still attached as your baby approaches that point, note how long it has been there and ask your baby’s doctor what to do next. [7]
This section focuses on the broad timeline and appearance. For step-by-step care, what separation can look like, or changes that may need medical attention, use the dedicated sections on stump care, separation, and infection signs rather than trying to judge every change on your own.
A simple way to keep track is to notice the general progression: the stump dries, becomes firmer, and eventually falls away. [5][6] You do not need to compare it with another baby’s stump; focus on the timeline for your own baby and bring questions to your baby’s doctor if it remains after three weeks. [7]
Common questions about the umbilical cord
Is the umbilical cord still needed after birth?
No. The umbilical cord has finished its role once your baby is born, so it is no longer needed after birth. [3]
You may still see a short stump attached to your baby, but that does not mean the cord is still serving its pregnancy role. If you are unsure what you are seeing, ask your baby’s doctor about your individual concern.
Is a dry, stiff stump expected?
Yes. After a couple of days, a dry, stiff stump is described as normal. [5]
A dry, stiff appearance can look different from the soft cord you may remember from birth. For example, the stump may feel firm rather than flexible; that change alone is consistent with the expected appearance described here.
What if the stump is still there after three weeks?
Contact your baby’s doctor if the stump remains after your baby is three weeks old. [7]
You can mention your baby’s age and that the stump has not fallen off when you call, so the doctor has the basic context. If the stump is still attached as the three-week mark approaches, you can contact the office then to ask what they recommend.
Should I worry if the stump looks different from day to day?
A dry, stiff stump after a couple of days is a normal appearance, but the guidance here does not address every change you might notice. [5] If you have a specific concern about your baby’s stump, ask the baby’s doctor rather than trying to judge the change from appearance alone.
What should I ask the doctor?
Describe what you see and how old your baby is, and ask whether your baby needs a visit. These details can help you explain your concern clearly without having to guess what the stump’s appearance means.
What to remember about the umbilical cord
Remember the umbilical cord’s role changes at birth: it supports your baby during pregnancy, then the remaining stump dries as the belly button heals. If you have a concern about your baby’s stump, ask the baby’s clinician for guidance.
During pregnancy, the cord connects the baby and placenta, supporting the baby’s needs before birth. [1] After delivery, that connection is no longer needed. [3] You can think of the cord as a temporary link that serves its purpose during pregnancy; what remains afterward is part of the body’s healing process.
As the stump dries and separates, the belly button area heals. [6] This change happens while you and your baby are getting used to everyday care, so it is understandable to have questions about what you see. For example, if you are unsure whether a change in the stump is expected, or simply want reassurance, contact your baby’s clinician rather than trying to judge it alone.
You do not need to have a perfect explanation of every stage to ask for help. When you reach out, describe what you have noticed and when you first noticed it; a clear example can help the clinician understand your concern. Keep the question focused on your baby’s stump and follow the clinician’s advice for your individual situation.
The key point is that the cord supports your baby before birth, while the stump is a temporary part of healing afterward. If anything about your baby’s stump worries you, contact the baby’s clinician and explain what you have noticed.