Pregnancy is a beautiful journey filled with exciting milestones, from seeing your baby grow during ultrasound scans to feeling the first movements. It comes with enough things to keep track of- appointments, scans, blood tests, and the constant question of whether everything is progressing normally.
So when an ultrasound shows that there is more amniotic fluid than expected, it's natural to worry. This is called polyhydramnios. Sometimes it may not cause serious problems and may settle on its own. However, identifying the possible cause and monitoring the pregnancy are important for the well-being of both mother and baby.
During pregnancy, the amniotic fluid protects the fetus, allows movement and supports development. This fluid is continuously being produced and swallowed by the baby, who excretes it as urine. Polyhydramnios occurs when there is an excess of amniotic fluid. It is usually found on ultrasound. Doctors assess the fluid using the amniotic fluid index (AFI) or deepest vertical pocket (DVP).
If the AFI value equals 24 cm or higher and the DVP value equals 8 cm or higher, it is diagnosed as polyhydramnios.
The condition is commonly classified by severity:
These measurements help doctors understand how much the fluid has increased and decide how closely the pregnancy should be monitored.
There is no single cause, and in many mild cases, no specific reason is found. Some recognised polyhydramnios causes include:
● Gestational or pre-existing diabetes.
● Problems affecting the baby's ability to swallow fluid, including some digestive or neurological conditions.
● Fetal anaemia or blood-group incompatibility.
● Certain infections during pregnancy.
● Twin-to-twin transfusion syndrome in some identical twin pregnancies.
● Certain genetic or chromosomal conditions.
A detailed ultrasound may be advised to assess fetal anatomy and growth. Testing for diabetes, infection or other conditions may also be recommended.
Mild polyhydramnios may cause no symptoms and is often found during a routine scan. When fluid is higher, the enlarged uterus can put pressure on nearby organs.
Possible symptoms include:
● Shortness of breath
● Abdominal discomfort or tightness
● Heartburn or indigestion
● Swelling of the legs and feet
● Rapid increase in abdominal size
A sudden increase in abdominal size or significant abdominal pain should be reported promptly.
Ultrasound is the main test used to confirm increased fluid. Depending on the findings, your doctor may recommend a detailed fetal scan, growth assessment, diabetes testing or other tests.
Complications in Polyhydramnios
Most mild cases do well with appropriate monitoring, but complications are more likely with moderate or severe polyhydramnios. Possible polyhydramnios complications include:
● Preterm contractions or birth
● Premature rupture of membranes
● Breech or another abnormal fetal position
● Umbilical cord prolapse after the waters break
● Higher likelihood of caesarean birth
● Heavy bleeding after delivery
The risk of complications generally increases with the severity of the condition.
Polyhydramnios itself does not cause birth defects. However, some fetal structural, genetic or neurological conditions can affect swallowing or fluid balance and lead to polyhydramnios. This is why doctors may recommend a detailed ultrasound after increased fluid is detected.
Having polyhydramnios does not mean that the baby has a birth defect; many cases, especially mild ones, have no identifiable cause.
Polyhydramnios treatment depends on the severity, cause, gestational age and symptoms.
● Mild cases often need observation and repeat scans.
● If diabetes is contributing, blood glucose management is important.
● An identified infection or underlying condition is treated appropriately.
● Severe polyhydramnios causing significant breathlessness or discomfort may sometimes be treated with amnioreduction, where a controlled amount of fluid is removed with a needle.
● Delivery planning depends on fetal well-being, fluid levels, symptoms and other obstetric factors.
Medicines should not be taken to reduce amniotic fluid unless specifically prescribed by a specialist.
When a pregnancy needs closer monitoring, access to maternal-fetal medicine and advanced diagnostics can make care more coordinated. Cloudnine offers fetal ultrasound, fetal wellbeing assessment, Doppler imaging, genetic counselling and selected fetal interventions through its maternal and fetal medicine services. Its teams also manage high-risk and complex pregnancies through multidisciplinary care.
Care focuses on the mother’s symptoms, the baby's development, the possible cause and what is safest at each stage.
Polyhydramnios can sound frightening, but an increased fluid level does not automatically mean something is wrong with the baby. Many cases are mild and have no identifiable cause. Regular antenatal visits and appropriate scans help doctors monitor the pregnancy. Seek medical advice promptly for sudden abdominal enlargement, significant breathlessness, pain, contractions or leaking fluid.
Yes. Most of the women with polyhydramnios deliver their babies in a perfectly healthy condition, especially when the condition is mild and without any underlying cause. Regular monitoring can also help manage any potential risks.
Various digestive, neurological, muscular, genetic or chromosomal disorders which can interfere with the baby's ability to swallow amniotic fluid can be associated with polyhydramnios. Nevertheless, polyhydramnios does not cause birth defects in most of the cases.
Drinking a lot of water does not generally cause polyhydramnios. Amniotic fluid levels are regulated mainly by the baby's urine production and swallowing, along with other maternal and fetal factors.
Genetic or chromosomal conditions such as Down syndrome, Edwards syndrome, and certain other genetic disorders can sometimes be associated with polyhydramnios, particularly when other fetal abnormalities are present.
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