Hydrops Fetalis: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Hydrops Fetalis?
A maternal-fetal medicine specialist is a doctor who cares for high-risk pregnancies. A neonatologist is a doctor who cares for sick newborns. Both usually treat hydrops fetalis. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What is hydrops fetalis?
Hydrops fetalis is a serious condition. It happens when too much fluid builds up in two or more body areas of a fetus or newborn. It is a symptom of underlying problems. There are two types, immune and nonimmune. The type depends on the cause of the extra fluid.
Symptoms
Symptoms depend on how severe the condition is. Mild forms may cause liver swelling. They may also cause a change in skin color (pallor).
More severe forms may cause:
- Breathing problems.
- Bruising or purple spots on the skin.
- Heart failure.
- Severe anemia (too few red blood cells).
- Severe jaundice (yellow skin and eyes).
- Swelling all over the body.
Causes and who gets it
Immune hydrops fetalis is most often a problem of severe Rh incompatibility. Here, a mother with Rh negative blood makes antibodies to her baby's Rh positive blood cells. Many of the baby's red blood cells are destroyed. This leads to swelling all over the body.
Nonimmune hydrops fetalis is more common. It causes up to 90% of cases. It happens when a disease or medical condition affects the body's ability to manage fluid. The main causes are heart or lung problems, severe anemia (from thalassemia or infections), and genetic problems such as Turner syndrome.
How doctors diagnose it
A scan during pregnancy may show high levels of amniotic fluid, the fluid around the baby. It may show fluid swelling in and around the baby's organs, such as the liver, heart, or lungs. Doctors also test the fluid around the baby (amniocentesis). Repeat scans show how severe it is.
Treatment
Treatment depends on the cause. During pregnancy, treatment may include:
- Medicine to cause early labor and delivery of the baby.
- Early cesarean delivery if the condition gets worse.
- Giving blood to the baby in the womb.
For a newborn, treatment may include:
- For immune hydrops fetalis, a transfusion of matching red blood cells.
- Removing extra fluid around the lungs and belly organs with a needle.
- Medicines for heart failure and to help the kidneys remove extra fluid.
- Ways to help the baby breathe, such as a breathing machine.
Hydrops fetalis often results in death of the infant shortly before or after delivery. The risk is highest for babies born very early or ill at birth. Brain damage called kernicterus may happen with Rh incompatibility. Delays in development have been seen in babies who got blood in the womb.
When to see a doctor
Rh incompatibility can be prevented if the mother is given RhoGAM during and after pregnancy.
Call 911 or go to the emergency room for bleeding that will not stop or severe belly pain. Also go if a baby has bluish or grey skin or is not alert.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. Such a doctor can explain test results, help you prepare questions, and coordinate care with specialists.
Common questions
Is hydrops fetalis a disease on its own?
No, hydrops fetalis is a symptom of underlying problems.
Can hydrops fetalis be prevented?
Sometimes, the immune type can. Immune hydrops fetalis is most often a complication of severe Rh incompatibility, which can be prevented.
What is the difference between immune and nonimmune hydrops fetalis?
Immune hydrops fetalis is most often caused by Rh incompatibility. Nonimmune hydrops fetalis is the more common type. A disease affects the body's ability to manage fluid.
How is hydrops fetalis found before birth?
It may be found before birth on an ultrasound done during pregnancy.
Is hydrops fetalis serious?
Yes, it is a serious condition. It often results in death of the infant shortly before or after delivery.
Sources
- MedlinePlus - Hydrops fetalis
- National Organization for Rare Disorders - Non-immune hydrops fetalis
- National Organization for Rare Disorders - Immune hydrops fetalis
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
