A caput succedaneum is more likely to form during a prolonged or difficult delivery. This is especially true after the membranes have ruptured, thus removing the protective cushion of the amniotic sac. Vacuum extraction can also increase the chances of a caput succedaneum.
However, a caput succedaneum is sometimes identified by prenatal ultrasound even before labor or delivery begins. It has been found as early as 31 weeks of gestation. More often than not, this is associated with either premature rupture of the membranes or too little amniotic fluid (oligohydramnios). All other things being equal, the longer the membranes are intact, the less likely a caput is to form.
Nevertheless, a caput succedaneum can form before or during birth even in the absence of any identifiable risk factor. Good prenatal care and management of labor and delivery can reduce the chances of this minor problem, but the formation of a caput succedaneum is often unpredictable and unavoidable.
Stoll, BJ, Kliegman, RM. Nervous System Disorders. In: Behrman, RE., Kliegman, RM, Jenson, HB, eds. Nelson Textbook of Pediatrics . 17th ed., Philadelphia, PA: Saunders; 2004:562
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