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Amniotic Sac
The amniotic sac is the name for the thin but tough ‘bag’ that lines the uterus during pregnancy and contains the baby and the amniotic fluid.
It is normal for the amniotic sac to break during labour (this is called ‘waters breaking’). When this happens, the amniotic fluid will begin to trickle out or flow out in a rush.
If, as can sometimes happen, the amniotic sac breaks prematurely, then most women will go into labour within 24 hours. However, some women can continue with the pregnancy for weeks as the amniotic fluid that is being lost is constantly being replaced. During this situation, it is important to monitor for infection.
