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The term for when the amniotic sac bursts and amniotic fluid is released from the vagina is commonly referred to as "waters breaking." This event typically occurs just before or during the onset of labor and is often one of the first signs that labor is imminent. It signifies that the protective environment surrounding the fetus is gone, and the birthing process is beginning or already underway.

In contrast, labor encompasses the entire process leading up to and including the delivery of the baby, which involves various stages and contractions. Stage One of labor specifically refers to the initial phase of labor, during which contractions begin and the cervix starts to dilate. Birth is the final event in the childbirth process when the baby is delivered. Thus, while all these terms are related to childbirth, "waters breaking" precisely defines the specific moment of rupture of the amniotic sac and the release of fluid.