Delayed cord clamping benefits and risks

What does the evidence say about delayed cord clamping during pregnancy?

1. The 2025 AHA and AAP guideline says waiting at least 60 seconds can benefit term newborns who do not need immediate resuscitation and recommends this delay for preterm newborns in the same situation. The team assesses breathing and temperature during the delay; needed ventilation must not be postponed. 1
2. ACOG's 2020 evidence review reported improved preterm circulation and red-cell volume, less transfusion, and lower rates of some serious preterm complications with delayed clamping. It found no evidence of increased maternal postpartum hemorrhage. Timing advice has since been updated in the 2025 neonatal guidance. 2
3. WHO international guidance recommends clamping no earlier than one minute for a newborn who does not need positive-pressure ventilation. It supports earlier clamping when the newborn must be moved for immediate ventilation, illustrating why clinical stability can override a planned delay. 3
4. A meta-analysis of 20 randomized trials involving 1,807 preterm infants associated delayed clamping with higher hemoglobin and hematocrit and lower anemia, necrotizing enterocolitis, hospital stay, and mortality. Several other outcomes were not significantly different, and optimal timing remained uncertain. 4
5. An NIH-funded trial follow-up compared a five-minute delay with clamping within 20 seconds. Among 44 infants imaged at four months, the delayed group had more myelin and ferritin but no difference in developmental test scores; the small selected follow-up cannot establish lasting developmental benefit. 5

Is delayed cord clamping safe in each trimester?

• First trimester. Delayed cord clamping is a birth-room decision, not a first-trimester procedure. Early pregnancy is a reasonable time to learn whether the planned hospital routinely offers it for both term and preterm births.
• Second trimester. Add the preference to birth discussions, but keep it conditional. Placenta previa, accreta concerns, cord or placental disruption, maternal instability, and anticipated newborn resuscitation can change what is feasible at delivery.
• Third trimester. Confirm the hospital's usual timing, newborn jaundice monitoring, and approach when resuscitation is needed. The plan should permit the birth team to clamp earlier if placental circulation is interrupted or either patient is unstable.