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Amniotic fluid. The amniotic fluid is the protective liquid contained by the amniotic sac of a gravid Amniote. This fluid serves as a cushion for the growing fetus, but also serves to facilitate the exchange of nutrients, water, and biochemical products between mother and fetus. For humans, the amniotic fluid is commonly called water or waters (Latin liquor amnii)
Levels of Amniotic Fluid. The amniotic fluid fills the amniotic sac throughout the entire pregnancy. At about the 34-week mark, the fluid is at its fullest - about 800mL. As the fetus grows larger in the last weeks of pregnancy, the fluid slowly begins to go down to around 600mL at the full-term mark.