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Polyhydramnios

Definition

Polyhydramnios occurs when too much amniotic fluid builds up during pregnancy. It is also called amniotic fluid disorder, or hydramnios.

Considerations

Amniotic fluid is the liquid that surrounds the baby in the womb (uterus). It comes from the baby's kidneys and developing urinary system, and then it goes into the uterus from the baby's urine. The fluid is absorbed when the baby swallows it and through breathing motions.

While in the womb, the baby floats in the amniotic fluid. It surrounds and cushions the infant during pregnancy. The amount of amniotic fluid is greatest at 34 to 36 weeks of pregnancy. Then the amount slowly decreases until the baby is born.

The amniotic fluid:

  • Allows the baby to move in the womb, promoting muscle and bone growth
  • Helps the baby's lungs to develop
  • Protects the baby from heat loss by keeping the temperature constant
  • Cushions and protects the baby from sudden blows from outside the womb

    • Causes

    Polyhydramnios can occur if the baby does not swallow and absorb amniotic fluid in normal amounts. This can happen if the baby has certain health problems, including:

  • Gastrointestinal disorders, such as , , , and
  • Brain and nervous system problems, such as and myotonic dystrophy

    • It can also happen if the mother has poorly controlled diabetes.

    Polyhydramnios also may occur if too much fluid is produced. This may be due to:

  • Certain lung disorders in the baby
  • Multiple pregnancy (for example, twins or triplets)
  • in the baby

    • Sometimes, no specific cause is found.

    When to Contact a Medical Professional

    Contact your health care provider if you are pregnant and notice that your belly is getting large very quickly.

    What to Expect at Your Office Visit

    Your provider measures the size of your belly at every visit. This shows the size of your womb. If your womb is growing faster than expected, or it is larger than normal for your baby's , the provider may:

  • Have you come back sooner than normal to check it again
  • Do an ultrasound of your womb

    • If your provider finds a birth defect, you may need to test for a genetic defect in your baby.

    Mild polyhydramnios that shows up later in pregnancy often doesn't cause serious problems.

    Severe polyhydramnios may be treated with medicine or by having extra fluid removed.

    Women with polyhydramnios are more likely to go into early labor. The baby will need to be delivered in a hospital. That way, the providers can immediately check the health of the mother and baby and give treatment if needed.

    References

    Buhimschi CS, Mesiano S, Muglia LJ. Pathogenesis of spontaneous preterm birth. In: Lockwood CJ, Copel JA, Dugoff L, eds. Creasy and Resnik's Maternal-Fetal Medicine: Principles and Practice. 9th ed. Philadelphia, PA: Elsevier; 2023:chap 7.

    Gilbert WM. Amniotic fluid disorders. In: Landon MB, Galan HL, Jauniaux ERM, et al, eds. Gabbe's Obstetrics: Normal and Problem Pregnancies. 8th ed. Philadelphia, PA: Elsevier; 2021:chap 28.

    Suhrie KR, Tabbah SM. The fetus. In: Kliegman RM, St. Geme JW, Blum NJ, Shah SS, Tasker RC, Wilson KM, eds. Nelson Textbook of Pediatrics. 21st ed. Philadelphia, PA: Elsevier; 2020:chap 115.

    Schedule An Appointment

    Contact Atlanta Obsetrics and Gynaecology at The Womens Center Millennium Hospital - 404-ATL-BABY

    GO

    Review Date: 4/25/2023

    Reviewed By: Charles I. Schwartz, MD, FAAP, Clinical Assistant Professor of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, General Pediatrician at PennCare for Kids, Phoenixville, PA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.