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Polyhydramnios is the presence of excessive amniotic fluid surrounding the unborn infant.
Amniotic fluid is a clear, slightly yellowish liquid that surrounds the unborn baby (fetus) during pregnancy. It is contained in the amniotic sac.
While in the womb, the baby floats in the amniotic fluid. Amniotic fluid surrounds and cushions the infant throughout development. The amount of amniotic fluid is greatest at around 34 weeks into the pregnancy (gestation).
The amniotic fluid constantly moves (circulates) as the baby swallows and "inhales" the fluid, and then releases or "exhales" the fluid through urine.
The amniotic fluid helps:
Polyhydramnios can occur if the fetus does not swallow and absorb amniotic fluid in normal amounts. This can happen due to:
Polyhydramnios may also be related to increased fluid production, which occurs with:
Sometimes, no specific cause for polyhydramnios is found.
Stoll BJ. High-risk pregnancies. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics. 18th ed. Philadelphia, Pa: Saunders Elsevier;2007:chap 95.
Gilbert WM. Amniotic fluid disorders. In: Gabbe SG, Niebyl JR, Simpson JL, eds. Obstetrics: Normal and Problem Pregnancies. 5th ed. Philadelphia, Pa: Churchill Livingstone; 2007:chap 31.
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