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🩺 Pregnancy & Maternal

Mothers should be aware of the condition of hydrops fetalis in the womb.

MBBS
Medically Reviewed by MBBS ✓ Medically Reviewed
📅 Updated: Jul 14, 2026 • ⏱ 7 min read • Editorial policy
Mothers should be aware of the condition of hydrops fetalis in the womb.
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Many mothers think about a thousand things when they are expecting a baby. The biggest thing is whether the baby is healthy and growing well. But sometimes we have to learn about medical conditions that we have not even heard of, and which are a little scary. One such rare, but definitely worth knowing about is this condition called 'Hydrops Fetalis'. Don't be afraid when you hear this. The most important thing is to be properly informed about this.

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What exactly is Hydrops Fetalis?

Simply put, this is when too much fluid accumulates in the body of a baby in the womb or a newborn. This fluid can accumulate anywhere, such as in the abdominal area, around the heart and lungs, or under the skin. Just imagine, the extra fluid that accumulates in this way puts a lot of pressure on the baby's heart and other vital organs. We need to understand that this is a serious condition that can even affect the baby's life if not treated properly.

What are the symptoms of this condition?

Every baby's symptoms may be different, but there are some common symptoms that can be seen. These can be divided into two categories: during pregnancy and after the baby is born.

Symptoms seen during pregnancy (via ultrasound) Symptoms seen after the baby is born
The amount of amniotic fluid surrounding the baby in the uterus increases significantly. The baby's skin is pale.
Placenta being thicker than normal. Heavy sweating.
The baby's spleen and heart become enlarged. Difficulty breathing.
Fluid buildup around the baby's organs, heart, or lungs.Enlarged liver and spleen.

There are two main types of Hydrops Fetalis:

This condition can be divided into two main types depending on how it occurs.

1. Non-immune hydrops

This is the most common type. It accounts for 80-90 percent of reported cases. It can be caused by a genetic disorder in the baby or a congenital defect. Simply put, this is because the baby's body is unable to properly manage its fluid levels.

This is a bit rare. It occurs when there is an incompatibility between the red blood cells in the mother's and the baby's blood .

Think of it this way: if the mother's blood type is Rh-negative and the baby's blood type is Rh-positive, the mother's immune system sees the baby's Rh-positive red blood cells as a 'foreign enemy.' It then makes antibodies to destroy those cells and sends them to the baby's body.

When too many of the baby's red blood cells are destroyed in this way, the baby develops a condition called anemia . Anemia is when there are not enough healthy red blood cells to carry oxygen throughout the body. Sometimes this can cause only minor health problems for the baby. But if it gets worse, the baby's heart can even stop working (heart failure).

What are the causes of Hydrops Fetalis?

The most important thing to understand is that Hydrops Fetalis is not a single disease. It is a symptom that occurs as a result of another underlying medical condition. There are several main causes that can contribute to this.

  • Hemolytic disease of the newborn: This occurs due to the incompatibility of the blood types of the mother and the baby, as we discussed earlier.
  • Severe anemia: This condition, caused by a decrease in red blood cells, can be a major cause of hydrops.
  • Infection: If the baby has an infection at birth, it can lead to this condition.
  • Heart and lung defects: If the baby's heart or lungs have not developed properly, that can also be a cause.
  • Other birth defects and congenital anomaliess and congenital anomalies): Some birth defects also increase the risk of this condition.
  • Liver disease: If there is a problem with the baby's liver, it can also cause Hydrops Fetalis.

How to recognize this condition?

Your doctor will often diagnose this condition during a routine prenatal ultrasound exam. If your baby has an abnormal amount of fluid in two or more places, he or she may suspect hydrops fetalis. The doctor will also check the amount of fluid, the thickness of the placenta, and whether the baby's organs, such as the heart and liver, are enlarged.

This condition can also be diagnosed through blood tests to determine if there are any incompatibilities between the mother and baby's blood.

How is it treated?

This is a somewhat complex condition, so treatment options depend on the underlying cause and the severity of the condition.

If this is detected during pregnancy, it may not always be possible to treat it. Sometimes, doctors may decide to deliver the baby early labor).

If a baby is born with Hydrops Fetalis, the baby will need specialized medical treatment .

  • The baby may need to be connected to a machine (ventilator) to help him breathe.
  • Extra fluid that has accumulated around the baby's heart, lungs, and stomach may also need to be removed using a needle.

The baby will need to be kept under the close supervision of a medical team at the hospital until the underlying condition is controlled. The best thing to do in such a situation is to talk to your doctor regularly and follow his/her instructions exactly.

💡 Take-Home Message

  • Hydrops Fetalis is an abnormal accumulation of fluid in the body of a fetus or newborn. This is a serious condition.
  • This is not a separate disease, but rather a symptom of another medical condition (e.g. anemia, infection, birth defects).
  • This is often diagnosed during an ultrasound scan during pregnancy.
  • One reason for this may be that the blood types of the mother and baby are not compatible (especially the Rh factor).
  • Treatment depends on the underlying cause. Specialized hospital care is required after the baby is born.
  • If you have any doubts or fears about this, talk to your doctor immediately. That's the most important thing.
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⚠️ Important: Medical articles and information on Nirogi Lanka are strictly for educational and awareness purposes and do not substitute professional medical advice, diagnosis, or treatment. Always consult a qualified physician for any medical concerns.