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amniotic fluid, which is composed mostly of water, fetal skin cells, electrolytes, and chemicals produced by the lungs. this fluid is regulated by the baby's intake and output of the fluid, which is necessary for the baby's nourishment and development. also, before 36 weeks, the fluid is of similar composition to the baby's plasma, but after 36 weeks it is composed mostly of the baby's urine (the baby swallows or "inhales" the amniotic fluid, then excretes or "exhales" the fluid).

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