This is called premature rupture of the membranes. It is more common in pre-term delivery. The most important symptom of PROM is fluid leaking from the vagina. It may gush or drip slowly. It may continue to flow all day, since it is still being produced by the baby.
Some mothers mistake it for urine, but the doctor can test it to confirm that it is amniotic fluid.
The cause of premature rupture is not always known. It may be caused by poor nutrition or infection, and is more common in cigarette smokers. Most mothers enter labor within 24 hours. If labor does not begin, the baby becomes susceptible to infection. Infections can be dangerous, and babies with infections or in an infected uterus should be born as soon as possible, regardless of their age.