Malpresentations and Positions & Operative Obstetrics
Most common cause of breech presentation is:
a. Breech presentation occurs in 3-4% of all deliveries.
b. The occurrence of breech presentation decreases with advancing, gestational age. Breech presentation occurs in 25% of births that occur before 28 weeks' gestation, in 7% of births that occur at 32 weeks, and 1-3% of births that occur at term.
c. Predisposing factors for breech presentation 'include prematurity, uterine abnormalities (malformations, fibroids), fetal abnormalities (CNS malformations, neck masses, aneuploidy), and multiple gestations. Prematurity is the most common cause of breech presentation.