How Common Are Congenital Heart Defects?

Congenital heart defects (CHDs) are the most common type of birth defect, affecting approximately 1 in every 100 births. That translates to about 40,000 babies born with a CHD in the United States each year. If your baby has been diagnosed with one, you are not alone, and the landscape of treatment has advanced enormously.

Most CHDs are not caused by anything a parent did during pregnancy. They develop early in fetal heart formation, often before many people even know they are pregnant, and the majority have no identifiable cause.

Types of Congenital Heart Defects

CHDs range from simple to complex, and the type your baby has determines the treatment path.

Simple CHDs

These are the most common and are often correctable with minimal intervention:

  • Atrial septal defect (ASD): A hole between the upper chambers of the heart. Small ASDs may close on their own. Larger ones can be repaired with a catheter-based procedure or surgery.
  • Ventricular septal defect (VSD): A hole between the lower chambers. VSD is the single most common CHD. Many small VSDs close without treatment.
  • Patent ductus arteriosus (PDA): A blood vessel that normally closes after birth stays open. Medication or a minor procedure can resolve it.

Complex CHDs

These involve more significant structural differences and typically require surgical intervention:

  • Tetralogy of Fallot (TOF): A combination of four heart defects that reduces oxygen flow. TOF is usually repaired with open-heart surgery in the first year of life, and long-term outcomes are generally very good.
  • Hypoplastic left heart syndrome (HLHS): The left side of the heart is severely underdeveloped. HLHS requires a series of surgeries or, in some cases, a heart transplant. This is among the most serious CHDs, but survival rates have improved significantly.
  • Transposition of the great arteries (TGA): The two main arteries leaving the heart are switched. TGA requires surgery within the first days or weeks of life, and the arterial switch operation has a high success rate.

How CHDs Are Detected

The Anatomy Scan

The standard anatomy scan, usually performed around 18 to 22 weeks, includes a basic evaluation of the fetal heart. Many CHDs are first identified or suspected during this scan.

Fetal Echocardiogram

If the anatomy scan raises any concerns, or if you have risk factors (family history of CHD, diabetes, certain medications), your provider may refer you for a fetal echocardiogram. This is a detailed ultrasound focused entirely on the baby's heart, typically performed by a pediatric cardiologist or a maternal-fetal medicine specialist. It provides much more information than a standard scan and can often identify the specific type of defect.

What Happens After a Diagnosis

Receiving a CHD diagnosis prenatally can feel overwhelming, but it also provides a significant advantage: time to plan. Knowing before birth allows your care team to prepare for exactly what your baby will need.

Building Your Team

After a prenatal CHD diagnosis, your care team will likely expand to include:

  • A maternal-fetal medicine specialist to monitor the pregnancy
  • A pediatric cardiologist to evaluate the defect and plan postnatal care
  • A neonatologist for the immediate newborn period
  • A pediatric cardiac surgeon if surgery will be needed

Birth Planning

Many babies with CHDs benefit from being delivered at a hospital with an on-site pediatric cardiac unit. This means the surgical team is already in place if your baby needs intervention immediately after birth. Your MFM and cardiologist will help determine the safest delivery plan.

For simple CHDs, delivery at a standard hospital may be appropriate. For complex CHDs, a planned delivery at a children's hospital or a center with a dedicated cardiac program is typically recommended.

The Treatment Landscape

The advances in pediatric cardiac care over the past few decades have been remarkable. Many CHDs that were once considered life-threatening are now routinely repaired with excellent long-term outcomes.

  • Catheter-based procedures can correct many simple defects without open surgery
  • Open-heart surgery in infancy has become highly standardized for common defects like TOF and TGA
  • Long-term survival rates for most CHDs now exceed 90%
  • Many children with repaired CHDs live full, active lives with regular cardiology follow-up

Emotional Support and Connection

A prenatal CHD diagnosis is emotionally heavy regardless of the severity. Connecting with other families who have walked this path can be genuinely helpful. Organizations like the Pediatric Congenital Heart Association and Mended Little Hearts offer peer support, educational resources, and community for families at every stage.

Your feelings, whatever they are, are valid. And seeking support is a sign of strength, not weakness.

Finding Specialists Through BAABY

If your baby has been diagnosed with a congenital heart defect, your prenatal care team is your foundation. BAABY's provider directory can help you search for OB-GYNs and maternal-fetal medicine specialists in your area who work closely with pediatric cardiology teams and can help you build the right care plan for your family.