Delayed Cord Clamping: Benefits, Timing and What Happens After Birth
Discover why delayed cord clamping is recommended for many newborns, how it supports iron stores and circulation, and when immediate clamping may be necessary.
The first minute after birth is one of the most remarkable transitions in human physiology.
A baby takes its first breaths, the lungs begin functioning independently, and circulation starts adapting to life outside the uterus. Meanwhile, the placenta and umbilical cord may still be transferring blood to the newborn.
For decades, immediate cord clamping was routine in many hospitals. Today, medical recommendations increasingly recognize the benefits of allowing this transition to continue briefly before separating the baby from the placenta.
But how long should clinicians wait, and does delayed clamping benefit every newborn?
Delayed cord clamping means waiting before clamping and cutting the umbilical cord after delivery. For vigorous term and preterm newborns, the American College of Obstetricians and Gynecologists (ACOG) recommends waiting at least 30–60 seconds. This allows additional placental blood transfer, improving early hemoglobin levels and iron stores. However, maternal or newborn emergencies may require a different approach.
What Happens to the Umbilical Cord After Birth?
Throughout pregnancy, the placenta provides oxygen and nutrients to the developing fetus while removing waste products.
The umbilical cord connects the baby to this system through three blood vessels: two arteries and one vein.
At birth, the baby’s lungs expand, pulmonary blood flow increases, and the circulatory system begins transitioning away from placental oxygen exchange.
This transition is not instantaneous.
While the cord remains intact, blood may continue moving between the placenta and newborn. This process is known as placental transfusion.
Delaying clamping allows additional blood to enter the baby’s circulation during this transition.
The amount transferred varies according to the timing of clamping, uterine contractions and other physiological circumstances.
Why Is Delayed Cord Clamping Recommended?
One of the clearest benefits is improved newborn blood volume.
Additional placental blood increases the baby’s circulating red blood cells and contributes to higher hemoglobin levels after birth.
Hemoglobin carries oxygen throughout the body.
The extra red blood cells also provide iron, which is important for growth and neurological development.
ACOG reports that delayed clamping in term infants is associated with improved hemoglobin at birth and better iron stores during the first several months of life.
This matters because iron deficiency during infancy can affect development.
However, improved iron stores should not be interpreted as a guarantee of better intelligence or long-term cognitive performance.
The established benefits concern early blood and iron status. Researchers continue investigating longer-term developmental outcomes.
How Long Should Cord Clamping Be Delayed?
Professional recommendations differ slightly.
ACOG recommends delaying clamping for at least 30–60 seconds in vigorous term and preterm newborns.
The World Health Organization recommends that clamping generally should not occur earlier than one minute after birth when appropriate care can be provided.
Some maternity services routinely wait longer.
However, there is no universal interval suitable for every delivery.
The newborn’s breathing, circulation and clinical condition must be considered alongside maternal health.
Waiting longer is not automatically better in every circumstance.
The goal is to provide the benefits of placental transfusion without delaying necessary medical care.
What Happens During the First Minute?
For a healthy newborn, the first minute may involve drying, assessing breathing and muscle tone, maintaining warmth and beginning skin-to-skin contact.
The baby may remain close to the mother while the umbilical cord is intact.
Meanwhile, blood continues transferring through the placental circulation.
Once the planned interval has passed, the healthcare professional places clamps on the cord and cuts between them.
The remaining umbilical stump gradually dries and separates after birth.
Cutting the cord does not cause pain because the cord itself lacks pain-sensitive nerves.
Importantly, delayed clamping does not necessarily mean delaying the first contact between mother and baby.
When conditions allow, both can occur together.
Why Are the Benefits Particularly Important for Premature Babies?
Premature newborns have smaller circulating blood volumes and face additional risks because their organs are still developing.
Delayed cord clamping can support cardiovascular stability during the transition after birth.
Research has also identified important benefits for preterm survival.
A 2023 individual-participant-data meta-analysis published in The Lancet examined randomized trials involving thousands of premature infants.
The analysis found that deferred cord clamping reduced mortality before hospital discharge compared with immediate clamping.
These findings strengthened the evidence supporting delayed clamping for eligible premature newborns.
However, premature babies may require immediate respiratory assistance or other interventions.
Whether those interventions can be provided while the cord remains intact depends on the baby’s condition, clinical resources and available equipment.
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Does Delayed Cord Clamping Increase Jaundice Risk?
Delayed cord clamping offers benefits, but it also introduces an important consideration.
Additional red blood cells eventually break down, producing bilirubin.
Bilirubin is responsible for the yellow discoloration associated with newborn jaundice.
ACOG identifies a small increase in jaundice requiring phototherapy among term infants receiving delayed cord clamping.
Phototherapy uses specialized light to reduce elevated bilirubin levels.
This does not mean delayed clamping should routinely be avoided.
Rather, maternity services should have appropriate systems for monitoring newborn jaundice and providing treatment when necessary.
The benefits of improved iron stores must be considered alongside this manageable risk.
Parents should also understand that jaundice has several causes. Delayed clamping is only one potential contributing factor.
Can Delayed Cord Clamping Happen During a C-Section?
Yes. Delayed cord clamping can be performed during cesarean delivery when maternal and newborn conditions allow.
The surgical team must consider bleeding, placental condition, uterine tone and the baby’s immediate needs.
During a cesarean birth, the newborn may remain near the surgical field while the planned delay occurs.
The exact procedure varies between hospitals.
Some operating rooms have established protocols that allow delayed clamping while maintaining sterile conditions and monitoring the newborn.
A cesarean delivery does not automatically require immediate cord clamping.
However, an emergency cesarean or complications during surgery may make a delay inappropriate.
When Might Immediate Clamping Be Necessary?
Delayed clamping should never take priority over urgent maternal or newborn care.
Immediate clamping may be necessary when:
- Severe maternal bleeding occurs
- The placenta separates or its circulation is disrupted
- The umbilical cord is damaged
- The newborn requires urgent interventions that cannot safely be provided with the cord intact
- Another obstetric emergency requires rapid separation
A baby who is not breathing effectively may require prompt respiratory support.
Research is examining whether some newborn resuscitation procedures can safely occur before clamping.
However, intact-cord resuscitation is not universally available, and established emergency care should not be delayed.
The appropriate decision depends on the clinical circumstances rather than a rigid birth-plan requirement.
Does the Baby Need to Be Held Below the Placenta?
Historically, some clinicians believed newborns needed to be positioned below the placenta to encourage blood transfer.
Research has challenged that assumption.
A randomized trial published in The Lancet found that placing healthy term newborns on the mother’s abdomen or chest did not significantly reduce placental transfusion compared with positioning them at the level of the vagina.
This finding is relevant because it supports combining delayed clamping with early maternal contact.
The baby can often remain close to the mother without compromising the intended benefits.
Maintaining warmth and monitoring breathing remain essential.
Delayed Cord Clamping and Cord Blood Banking
Families considering cord blood banking should discuss their plans before delivery.
Cord blood contains blood-forming stem cells used in established treatments for certain blood and immune disorders.
Collection generally occurs after the cord has been clamped and cut.
Delayed clamping transfers additional blood to the newborn, potentially reducing the volume remaining for collection.
This may affect whether a sample meets banking requirements.
ACOG advises that routine cord blood collection should not compromise obstetric or neonatal care or alter delayed clamping when medically appropriate.
Parents should understand that maximizing placental transfusion and collecting the largest possible cord blood sample may involve competing objectives.
The discussion is best held during pregnancy rather than immediately after delivery.
Should Delayed Cord Clamping Be Included in a Birth Plan?
Yes. Parents can communicate their preference during prenatal appointments.
A practical request is:
“We would like delayed umbilical cord clamping when medically appropriate, including during cesarean delivery if circumstances allow.”
This communicates the preference while recognizing that emergencies may require a different approach.
Parents can also ask their maternity team about the hospital’s standard timing, whether skin-to-skin contact can begin before clamping, and how procedures change when newborn resuscitation is required.
These conversations can clarify expectations without creating unnecessary pressure during delivery.
When to Discuss Cord Clamping With Your Healthcare Team
Delayed cord clamping should be discussed during routine prenatal care, particularly when planning a cesarean birth or when pregnancy complications increase the possibility of premature delivery.
Families considering cord blood banking should raise the issue early.
Women with placental complications or conditions associated with increased bleeding risk may also need individualized advice.
The birth plan should document preferences while allowing clinicians to respond appropriately to unexpected circumstances.
The First Minute Matters
Delayed cord clamping reflects a more detailed understanding of the transition from fetal to newborn circulation.
The placenta does not instantly become irrelevant when the baby is delivered.
For many newborns, allowing additional blood transfer improves early hemoglobin levels and iron stores. For eligible premature infants, evidence also supports important survival benefits.
However, delayed clamping is not an absolute rule.
The safest approach combines evidence-based timing with careful assessment of the mother, newborn and circumstances of delivery.
Understanding the benefits and limitations allows parents to participate in informed birth planning without treating a particular number of seconds as the measure of a successful delivery.
Frequently Asked Questions
Is delayed cord clamping recommended for all babies?
Delayed cord clamping is recommended for many vigorous term and preterm newborns. Maternal emergencies, placental complications or urgent newborn care may require immediate clamping.
Does delayed cord clamping hurt the baby?
No. The umbilical cord lacks pain-sensitive nerves, so clamping and cutting it do not cause pain.
Can delayed cord clamping happen during a C-section?
Yes. It can be performed during cesarean delivery when maternal and newborn conditions allow.
Does delayed cord clamping prevent anemia?
Delayed clamping improves early hemoglobin levels and iron stores, potentially reducing iron deficiency. It does not guarantee that anemia will never develop.
Can delayed cord clamping and cord blood banking happen together?
Sometimes. However, additional placental blood transfer may reduce the volume available for banking. Families should discuss both priorities before delivery.
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