SEPARATION OF UMBILICAL CORD
The mechanism of cord separation is not fully understood.
After the umbilical cord is cut and clamped, cord separation is thought to be initiated by thrombosis and contraction of the umbilical vessels.
This is followed by granulocyte- and phagocyte-mediated necrosis, collagenous degeneration, and infarction of the cord tissue.
The stump gradually shrivels, dries, and separates by the end of the first to second postnatal week (mean, 6–13 days), 10٪ of healthy infants at 3 wks or after.
Age at which the cord separates may vary based on factors such as mode of delivery, gestational age, birthweight, and neonatal infections.
The timing of umbilical cord separation is often a source of concern to parents.
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