Polyhydramnios is most common in the third trimester.Amniotic fluid helps your baby grow and develop normally. The following can cause polyhydramnios:Your healthcare provider will examine you and ask about your symptoms. The umbilical cord may drop into your vagina before the baby. Polyhydramnios occurs in about 1 to 2 percent of pregnancies.Most cases of polyhydramnios are mild and result from a gradual buildup of amniotic fluid during the second half of pregnancy. © 1998-2020 Mayo Foundation for Medical Education and Research (MFMER). Any use of this site constitutes your agreement to the Terms and Conditions and Privacy Policy linked below.

You may have heavy bleeding after delivery.You may not be able to prevent polyhydramnios. Tell him if your baby is moving less than usual, or if any fluid leaked from your vagina.

All rights reserved. We comply with the HONcode standard for trustworthy health information - Advertising revenue supports our not-for-profit mission.Check out these best-sellers and special offers on books and newsletters from Mayo Clinic. All illustrations and images included in CareNotes® are the copyrighted property of A.D.A.M., Inc. or IBM Watson HealthAlways consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.The easiest way to lookup drug information, identify pills, check interactions and set up your own personal medication records. The fluid does the following during pregnancy:Amniotic fluid starts to develop in the womb soon after conception. This can prevent your baby from getting enough oxygen during delivery. Severe polyhydramnios may require closer monitoring.Polyhydramnios symptoms result from pressure being exerted within the uterus and on nearby organs.Mild polyhydramnios may cause few — if any — signs or symptoms. Ben-Chetrit A, Hochner-Celnikier D, Ron M, Yagel S. Hydramnios in the third trimester of pregnancy: a change in the distribution of accompanying fetal anomalies as a result of early ultrasonographic prenatal diagnosis. Acute polyhydramnios at 16–22 weeks is mainly seen in association with twin-to-twin transfusion syndrome. He may grow more than expected.

Polyhydramnios (pol-e-hi-DRAM-nee-os) is the excessive accumulation of amniotic fluid — the fluid that surrounds the baby in the uterus during pregnancy. "Mayo," "Mayo Clinic," "MayoClinic.org," "Mayo Clinic Healthy Living," and the triple-shield Mayo Clinic logo are trademarks of Mayo Foundation for Medical Education and Research. You may need any of the following:Mild polyhydramnios may not need to be treated.

In polyhydramnios, excessive amniotic fluid accumulates in the uterus during pregnancy. The fluid contains mainly urine from the unborn baby by the end of the pregnancy.

Most cases of mild polyhydramnios are idiopathic, but most cases with moderate or severe polyhydramnios are due to maternal or fetal disorders.

Tell him about all medicines you are taking. This fluid surrounds your unborn baby in the womb. Severe cases may require treatment.Polyhydramnios (pol-e-hi-DRAM-nee-os) is the excessive accumulation of amniotic fluid — the fluid that surrounds the baby in the uterus during pregnancy. Polyhydramnios occurs in about 1 to 2 percent of pregnancies.Most cases of polyhydramnios are mild and result from a gradual buildup of amniotic fluid during the second half of pregnancy. Fetal Diagn Ther 2012; 32:251. Acute polyhydramnios at 16–22 weeks is mainly seen in association with twin-to-twin transfusion syndrome.

Idiopathic polyhydramnios and postnatal abnormalities. If it is severe, you may need any of the following:Your water may break early, and your baby may be born prematurely. Most cases of mild polyhydramnios are idiopathic, but most cases with moderate or severe polyhydramnios are due to maternal or fetal disorders. Polyhydramnios is a condition that causes you to have too much amniotic fluid during pregnancy. Mild cases of polyhydramnios may go away on their own.