molding
The overlapping of fetal skull bones during passage through the birth canal, creating a temporarily elongated head shape.
Full Definition
Molding is a normal physiological process during vaginal delivery where the soft bones of the fetal skull overlap at the suture lines to reduce the head circumference and facilitate passage through the pelvis. The degree of molding depends on factors such as pelvic size, duration of labor, and fetal head position. Mild molding is normal and resolves within days after birth, but excessive molding may indicate cephalopelvic disproportion or prolonged labor. Assessment of molding helps clinicians evaluate the progress of labor and the likelihood of successful vaginal delivery. Severe molding can be associated with increased risk of intracranial injury.
Usage
Usage note: Distinguish from caput succedaneum, which is soft tissue swelling.
In Context
- "Minimal molding was observed in this precipitous delivery." — Newborn examination notes
- "Significant molding present, suggesting prolonged second stage of labor." — Delivery assessment