The amniotic fluid is part of the baby’s life support system . It protects your baby and aids in the development of muscles, limbs, lungs and the digestive system. Amniotic fluid is produced soon after the amniotic sac forms, about 12 days after conception. It is first made up of water that is provided by the mother.
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http://www.americanpregnancy.org/pregnancycomplications/highamnioticfluidpoos.htm