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Position the center of a vacuum cup 3 cm from the posterior fontanel, which puts the leading part of the cup about 3 cm from the anterior fontanel.
Vacuum-assisted deliveries have a low risk of complications such as cephalohematoma when the cup is placed in the midline of the fetus's head with the center of the cup 3 cm in front of the posterior fontanel, and when the cup is applied only when the fetus is in a low station with the fetal caput visible, said Dr.

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