There are common factors which may cause a woman to deliver rapidly.

These factors include:

a. A multipara with relaxed pelvic or perineal floor muscles may have an extremely short period of expulsion.

b. A multipara with unusually strong, forceful contractions. Two to three powerful contractions may cause the baby to appear with considerable rapidity.

c. Inadequate warning of imminent birth due to absence of painful sensations during labor.