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When a woman becomes pregnant and the fertilized egg attaches to the uterine wall, the egg is surrounded by a balloon-type bag called the amniotic sac. The sac is a strong material but can be damaged-- example, in a major traffic accident. Amniotic fluid within the sac surrounds the fetus in a special fluid environment in which the fetus can grow. It is a self-contained sac, until the sac breaks just before delivery or is broken by a doctor to hasten labor. The sac expands during the full 9 months, enlarging as the fetus grows. It cushions the baby from most low-impact activities - example, walking. It also protects the fetus from external infections, giving the fetus the best opportunity to thrive.

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