How long should cord clamping be delayed?

Our recommendation is to wait at least 5 minutes, ideally until the cord stops pulsing and beyond. ACOG sets a minimum of 30 to 60 seconds, but 90 seconds should be considered the absolute minimum for meaningful benefit, and longer is better. Blood keeps transferring even after visible pulsing stops, so waiting until the placenta delivers ensures your baby receives their full blood volume.

Is delayed cord clamping safe? What is the downside?

The only clearly documented concern is a small increase in newborn jaundice that may need light treatment (phototherapy). Studies suggest about 5 to 10% of delayed-clamped term babies need phototherapy, versus about 3 to 5% of immediately-clamped babies. Phototherapy is safe and effective, usually 12 to 48 hours under special lights. Feared risks like polycythemia (too many red blood cells) and extra bleeding for mom have not held up in the research.

What if the cord is wrapped around the baby’s neck?

A nuchal cord happens in 20 to 30% of all births and is usually not a problem. Your baby keeps receiving oxygen through the cord even when it is around the neck, so clamping it immediately can cut off that oxygen before the baby has started breathing air. Ask your provider to use the somersault maneuver or to slip the cord over the head while keeping it intact. Delayed clamping is still possible and beneficial in almost all nuchal cord situations.

When is immediate clamping actually necessary?

There are genuine situations: placental abruption or other cases where the placenta is no longer circulating blood, a cord that tears away, cord prolapse, or a maternal emergency like life-threatening hemorrhage or cardiac arrest. Even when a baby needs resuscitation, new evidence suggests it can often be done with the cord intact so the placenta keeps supporting the baby. True emergencies are rare. Slow labor, routine concerns, a nuchal cord, or "hospital policy" are not medical reasons for immediate clamping.

Can I do delayed cord clamping and still bank cord blood?

Yes, but with a real trade-off, because both want the same blood. Immediate clamping maximizes the volume available to collect. With delayed clamping, most of that blood has already gone to your baby: about 80% has transferred by 30 seconds and 85 to 90% by 60 seconds, so waiting past about 60 seconds leaves little to collect, and it becomes almost impossible to gather enough for a public bank to accept. One compromise is to request a shorter 30-second delay followed by collection. Another is cord tissue banking, which is unaffected by timing and fully compatible with delayed clamping. See our cord blood banking coverage for the full picture.

Does delayed cord clamping cause jaundice?

It causes a small, manageable increase, not a dangerous one. Studies suggest about 5 to 10% of delayed-clamped term babies need phototherapy (light treatment) for jaundice, compared to about 3 to 5% of immediately-clamped babies. Phototherapy is safe and effective, usually 12 to 48 hours under special lights, and ACOG recommends that hospitals offering delayed clamping have protocols to monitor and treat it. This is separate from the polycythemia worry (too many red blood cells), which a major Cochrane review found is not actually increased by delayed clamping.

Can I have delayed cord clamping with a c-section?

Yes. Delayed cord clamping is absolutely possible during a cesarean birth, and the benefits are identical to a vaginal birth. In the operating room, the provider holds the baby at or slightly below the level of the placenta, which is still inside your uterus, while the cord keeps transferring blood, then clamps after the delay and continues as normal. The main trade-off is a slight increase in operative time, typically 60 to 90 seconds, with no increased maternal bleeding and no interference with your spinal or epidural. Ask for it in advance and discuss it with your surgical team, since many hospitals now do this routinely for both scheduled and emergency cesareans.

Delayed Cord Clamping: Why Waiting Matters for Your Baby

Q: What if my baby needs help breathing right away?

Choosing immediate clamping in that moment is a safety call, not a failure of your birth plan. But it may not even be necessary: new evidence suggests that even when a baby needs resuscitation, they can often be stabilized with the cord intact, so the placenta keeps supporting gas exchange at the exact moment your baby needs it most. Cutting the cord removes that support system right when it helps most. It is worth asking in advance whether your hospital can resuscitate with the cord intact. A birth that needed early clamping is not a birth that went wrong.

In the first moments after birth, someone decides when to clamp your baby’s umbilical cord. That single choice changes how much blood, iron, and oxygen your baby receives from the placenta. For decades the standard was to clamp within 15 to 30 seconds. Now the evidence is clear: waiting gives your baby real, lasting benefits with virtually no downside.

This is one of the easiest birth preferences to request, and one of the most important. Here is what the research shows, and how to ask for it.

How Informed Parents Approach Cord Clamping

Before the details, here is the heart of this decision. Unlike some birth choices, this one is not a coin toss between equal paths. The evidence points one way. What informed parents actually weigh is the timing, and the uncommon situations where clamping early is the right thing to do.

Why informed parents choose to wait

At the moment of birth, roughly one-third of your baby’s blood is still outside their body, in the placenta and cord. Waiting lets it finish flowing where it belongs. Delaying gives your baby 25 to 40% more blood volume, about 50% more iron-rich red blood cells (enough to help prevent iron deficiency through the first 6 to 8 months), and the cord blood’s stem cells, the building blocks for blood and immune cells, naturally and for free. In a study funded by the NICHD, MRI scans at 4 months showed babies who had delayed clamping had more myelin, the insulation that lets the brain signal quickly, in regions tied to motor, visual, and sensory function. The value underneath the choice is simple: this blood is not extra, it is your baby’s own, and waiting a few minutes gives them their full blood volume.

When early clamping is genuinely the right call

There are real situations where immediate clamping may be necessary, and choosing it in those moments is not a failure. These include cases where the placenta is no longer circulating blood (placental abruption, a cord tearing away from the placenta, cord prolapse) and maternal emergencies such as life-threatening hemorrhage or cardiac arrest. Even when a baby needs help breathing, new evidence suggests they can often be stabilized with the cord intact, so it is worth asking whether your hospital can do that. But true emergencies requiring immediate clamping are rare, and slow labor, routine concerns, a nuchal cord, or "hospital policy" are not medical reasons to clamp early. Knowing the real reasons lets you tell an emergency apart from a habit.

This is one of the clearer decisions. The evidence points toward waiting; the real judgment is the timing and the uncommon situations that call for early clamping. A birth that needed early clamping is not a birth that went wrong.

What Delayed Cord Clamping Is

Before birth, blood flows between your baby and the placenta through the umbilical cord. At birth, that blood is still flowing. The longer you wait to clamp, the more of it your baby receives. Delayed cord clamping simply means waiting before clamping and cutting the cord.

Here is the part most people are never told: this blood is not "extra." It is your baby’s own blood, stored temporarily in the placenta and cord, and it represents their full blood volume. At the moment of birth, roughly one-third of your baby’s blood is still outside their body. Immediate clamping (clamping within 15 to 30 seconds) is the intervention here, not the norm. It became standard practice in the mid-20th century mainly for convenience and efficiency, not because there was evidence it was safer or better.

One more thing worth knowing: blood transfer continues even after the visible pulsing stops. The cord may look white and limp while gravity and pressure keep moving blood to your baby, which is why some experts recommend waiting even longer than until pulsing stops.

Watch: 90 Seconds to Change the World

Dr. Alan Greene's TEDx talk lays out the case in under 20 minutes: at birth, about a third of your baby's blood is still in the placenta and cord, and a short wait lets it finish flowing where it belongs. It is the clearest short explanation of why those first minutes matter.

What Hospitals Tell You

The guidance has caught up with the science. The World Health Organization recommended delayed clamping for all births in 2012, and by 2020 the American College of Obstetricians and Gynecologists (ACOG) recommended it too. Many hospitals now list a 30 to 60 second delay as their standard practice.

What often gets left out is that the official minimums are just that: minimums. A 30 to 60 second delay is better than immediate clamping, but 90 seconds should be considered the absolute floor for meaningful benefit, and the transfer keeps going well past that. The guidelines set a low bar so busy hospitals can meet it, not because more waiting stops helping your baby.

The other thing rarely mentioned: practice still lags the guidance. Some providers clamp immediately out of habit, outdated training, or schedule pressure. That is why this belongs in your birth plan, and why it helps to be specific about the timing you want.

The Full Picture: What Waiting Gives Your Baby

This is one of the rare birth decisions where the evidence points clearly in one direction. The benefits are documented in dozens of studies involving thousands of babies. Here is what those minutes buy.

30% More Blood, and 50% More Iron

Delaying gives your baby 25 to 40% more blood volume than immediate clamping. That means better oxygen delivery, steadier blood pressure, and better blood flow to vital organs including the brain during the critical transition from womb to world.
Your baby also receives about 50% more iron-rich red blood cells, enough iron to help prevent iron deficiency through the first 6 to 8 months of life.
At 4 months, babies who had delayed clamping had 45% higher iron stores and a 90% reduction in iron deficiency compared to immediately-clamped babies.

Brain Development and Stem Cells

Iron matters most for the brain in the first 3 years. A serious early deficiency can cause lasting damage even after iron is later restored, which is why those first stores count.
In a study funded by the NICHD, MRI scans at 4 months showed babies who had delayed clamping had more myelin, the insulation around nerve fibers that lets the brain signal quickly, in regions tied to motor, visual, and sensory function.
The cord blood is rich in stem cells, the building blocks for blood and immune cells. Delaying gives your baby their own stem cells naturally and for free, the same cells banking companies charge thousands to store.

For preterm babies, the case is even stronger

Premature babies benefit the most. A 2023 study of 47 trials found that delays of 120 seconds or more reduced neonatal death by 69% compared to immediate clamping. Delayed clamping also cuts the need for blood transfusions (as much as a 50% reduction in some studies) and lowers rates of serious complications, including bleeding in the brain and serious intestinal infections. These benefits are so substantial that many neonatal intensive care units have made delayed clamping standard for preterm births.

ACOG recommends at least 60 seconds of delay for preterm infants who do not need immediate resuscitation. If there is any chance of early delivery, make sure your team knows you want delayed clamping and why.

The Concerns, Honestly

We are not going to pretend there is no trade-off at all. There is one, and it is small and manageable. The other worries you may hear have not held up in the research.

Jaundice: the one real trade-off

The only clearly documented concern is a small increase in newborn jaundice (a yellowing of the skin from bilirubin buildup) that may need phototherapy, or light treatment. Studies suggest about 5 to 10% of delayed-clamped term babies need phototherapy, compared to about 3 to 5% of immediately-clamped babies.

Phototherapy is safe and effective, usually requiring only 12 to 48 hours under special lights. ACOG recommends that if you choose delayed clamping, your hospital should have protocols to monitor and treat jaundice. For most families, this small, treatable risk is easily worth the substantial benefits.

Polycythemia and maternal bleeding: not the risks they were feared to be

Some worried the higher red blood cell count could cause polycythemia (too many red blood cells) and lead to breathing or circulation problems. A major Cochrane review found delayed-clamped babies are not at increased risk of polycythemia compared to immediately-clamped babies.

Others worried delayed clamping might increase a mother’s bleeding after delivery. Multiple studies found it was not associated with increased postpartum hemorrhage or blood loss. WHO recommends delayed clamping equally for vaginal and cesarean births precisely because the safety data support it.

Special Situations

You can delay clamping during a C-section

This is one of the most important things to know if you are planning or might need a cesarean. The provider can hold your baby at or slightly below the level of the placenta while the cord keeps transferring blood, then clamp after the delay. The benefits are identical to a vaginal birth, and the main trade-off is a slight increase in operative time, typically 60 to 90 seconds, with no increased risk of maternal bleeding and no interference with your spinal or epidural. Many hospitals now do this routinely. Put it in your birth plan and discuss it with your surgical team.

A cord around the neck usually is not a reason to clamp

A nuchal cord (the cord wrapped around the baby’s neck) happens in 20 to 30% of all births and is usually not a problem. The common reflex is to clamp and cut immediately, but in most cases that is unnecessary and can backfire: your baby keeps getting oxygen through the cord even when it is around the neck, so cutting it before they breathe air can create the very problem it is meant to prevent. Ask your provider to use the somersault maneuver, gently guiding the baby out from under the loop, or to slip the cord over the head while keeping it intact. Delayed clamping is still possible in almost all nuchal cord situations.

When immediate clamping genuinely is necessary

There are real situations where immediate clamping may be the right call, and there is no shame in a birth that required it. These include cases where the placenta is no longer circulating blood (placental abruption, a cord tearing away from the placenta, cord prolapse) and maternal emergencies such as life-threatening hemorrhage or cardiac arrest.

One important note about resuscitation: even if your baby needs help breathing, new evidence suggests they can often be stabilized with the cord intact, so the placenta keeps supporting gas exchange at the exact moment your baby needs it most. It is worth asking whether your hospital can do this.

True emergencies requiring immediate clamping are rare. Slow labor, routine concerns, a nuchal cord, or "hospital policy" are not medical reasons to clamp early.

Delayed Clamping vs. Cord Blood Banking

These two goals pull against each other, because both want the same blood. Immediate clamping maximizes the volume available to collect for banking. With delayed clamping, most of that blood has already gone to your baby: about 80% has transferred by 30 seconds and 85 to 90% by 60 seconds, so a longer delay leaves little to collect. After 60 seconds, it becomes "almost impossible" to collect enough for a public bank to accept.

It helps to look at the actual usage numbers. The chance a child ever needs their own stored cord blood is somewhere around 1 in 20,000 to 1 in 250,000. For most cord blood stored privately, it is never used. Private banking runs roughly $1,400 to $2,500 upfront plus $175 to $300 a year.

ACOG’s guidance: "The practice of umbilical cord clamping should not be altered solely for the purpose of collecting cord blood." If banking matters to you, one option is cord tissue banking, which is unaffected by timing and fully compatible with delayed clamping.

The Honest Truth About Why Some Providers Clamp Early

Let us name something that rarely gets said out loud: one reason some providers prefer immediate clamping is that it is more convenient for them. After your baby is born, most of their work is done. Waiting a few minutes for the cord to stop pulsing means standing there while their schedule waits too.

This is not about blaming any individual nurse or doctor. Most genuinely want what is best for you and your baby, and the pressure they are under is systemic: busy shifts, other patients, institutional habit. But it is worth being clear-eyed about the math. Clamping immediately lets them hand off the baby and move on. Waiting is a few minutes of their time versus months, even years, of your baby’s health. They will not be managing your baby’s iron deficiency at 6 months. You will.

Waiting is part of the job. If a provider suggests delayed clamping is inconvenient, takes too long, or is not their "usual practice," remember that you are not being difficult by asking. You are advocating for evidence-based care. This is one of the easiest requests to honor, and most providers, when asked directly and specifically, will accommodate it.

And be clear on one thing: this is your birth, and the timing is yours to set. There are other people in the room with valid roles, but a recommendation is not an order. If your team suggests clamping earlier than you want and there is no emergency, you can say you would like to wait until the cord stops pulsing, and you can hold that line. Barring a genuine medical reason, the choice of how long to wait belongs to you, not to the schedule.

Our Take

Delayed cord clamping is one of the most evidence-backed decisions you can make for your birth. Every major medical organization recommends it. The benefits are real and lasting, and the only genuine concern, a small increase in treatable jaundice, is easily managed.

Our recommendation is to wait at least 5 minutes, ideally until the cord stops pulsing and beyond. Here is the way to think about it: if someone suggested taking away one-third of an adult’s blood immediately after a medical procedure, we would recognize that as harmful. That is roughly what immediate clamping does to a baby who is owed their own blood. In an uncomplicated birth, which is the vast majority of births, there is simply no medical reason to clamp before the cord stops pulsing.

None of this is a verdict on any birth that needed early clamping. Real emergencies happen, and a baby who needed immediate care got exactly what they needed. This is about the ordinary, unhurried birth, where the only thing standing between your baby and their full blood volume is a request and a few minutes of patience.

Ask for it, and be specific about the timing. It is free, it is safe, it is evidence-based. Your birth. Your body. Your baby. Your choice.

Questions to Ask Your Provider

Do you support delayed cord clamping, and how long do you typically wait?
Can we wait at least 5 minutes, or until the cord stops pulsing, if there are no complications?
Will delayed clamping be honored during a cesarean birth?
If our baby needs medical attention, can you provide it with the cord still intact?
Under what specific circumstances would you recommend immediate clamping instead?
If our baby has a nuchal cord, will you keep it intact using the somersault maneuver rather than cutting it?

Sources

This article is drawn from our research guide. The sources below are the peer-reviewed studies and clinical guidance behind the key facts on this page.

Usher R, Shephard M, Lind J. (1963). The Blood Volume of the Newborn Infant and Placental Transfusion. Acta Paediatrica. doi.org/10.1111/j.1651-2227.1963.tb03809.x
Mercer JS, Erickson-Owens DA. (2012). Rethinking Placental Transfusion and Cord Clamping Issues. Journal of Perinatal and Neonatal Nursing, 26(3), 202-217. doi.org/10.1097/jpn.0b013e31825d2d9a
WHO. (2012). Guideline: Delayed Umbilical Cord Clamping for Improved Maternal and Infant Health and Nutrition Outcomes. World Health Organization.
ACOG. (2020). Committee Opinion 814: Delayed Umbilical Cord Clamping After Birth. American College of Obstetricians and Gynecologists. www.acog.org/clinical/clinical-guidance/committee-opinion/articles/2020/12/delayed-umbilical-cord-clamping-after-birth
Chaparro CM. (2011). Timing of umbilical cord clamping: effect on iron endowment of the newborn and later iron status. Nutrition Reviews, 69(Suppl 1), S30-S36. doi.org/10.1111/j.1753-4887.2011.00430.x
Lozoff B, Georgieff MK. (2006). Iron Deficiency and Brain Development. Seminars in Pediatric Neurology, 13(3), 158-165. doi.org/10.1016/j.spen.2006.08.004
Andersson O, Hellstrom-Westas L, Andersson D, Domellof M. (2011). Effect of delayed versus early umbilical cord clamping on neonatal outcomes and iron status at 4 months: a randomised controlled trial. BMJ, 343, d7157. doi.org/10.1136/bmj.d7157
NICHD Brain Development Research. (2019). National Institute of Child Health and Human Development. Delayed cord clamping and brain myelination at 4 months. www.nichd.nih.gov/newsroom/news/022719-delayed-cord-clamping
Seidler AL, et al. (2023). Deferred cord clamping, cord milking, and immediate cord clamping at preterm birth: a systematic review and individual participant data meta-analysis. The Lancet. doi.org/10.1016/s0140-6736(23)02468-6
McDonald SJ, Middleton P. (2008, updated 2013). Effect of timing of umbilical cord clamping of term infants on maternal and neonatal outcomes. Cochrane Database of Systematic Reviews. doi.org/10.1002/14651858.cd004074.pub2
Andersson O, et al. (2013). Effects of delayed compared with early umbilical cord clamping on maternal postpartum hemorrhage and cord blood gas sampling. Acta Obstetricia et Gynecologica Scandinavica, 92(5), 567-574. doi.org/10.1111/j.1600-0412.2012.01530.x
Canadian Blood Services / Parents Guide to Cord Blood. Cord blood usage statistics. parentsguidecordblood.org/en/can-i-have-delayed-cord-clamping-and-still-collect-cord-blood
Allan DS, et al. (2016). Delayed clamping of the umbilical cord after delivery and implications for public cord blood banking. Transfusion, 56(3), 662-665. doi.org/10.1111/trf.13424
Cavallin F, et al. (2019). Delayed Cord Clamping versus Early Cord Clamping in Elective Cesarean Section. Neonatology, 116(3), 252-259. doi.org/10.1159/000500325
Pratesi S, et al. (2018). Placental Circulation Intact Trial (PCI Trial). Frontiers in Pediatrics, 6, 364. doi.org/10.3389/fped.2018.00364

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Medical Disclaimer: This information is for educational purposes only and does not constitute medical advice. We are not doctors. Delayed cord clamping is recommended by ACOG and the WHO for healthy newborns, but individual circumstances vary, and some situations call for immediate clamping. Always discuss your specific situation with your healthcare provider.

Last reviewed July 21, 2026.