Can a Neonatal Echo Detect Heart Defects Missed During Pregnancy?

During pregnancy, parents undergo several ultrasound scans to check their baby's growth and development. These scans also help doctors examine the baby's heart. However, some heart problems may not be visible before birth, even when pregnancy scans appear normal.

This can leave parents wondering: Can a heart problem still be present after a normal pregnancy ultrasound?

Yes, a neonatal echo test can detect certain heart defects that were not identified during pregnancy. It uses ultrasound to examine a newborn's heart structure, pumping function, and blood flow. Doctors may recommend this test when they notice unusual symptoms or suspect a heart condition.

Let's understand how this test works, what it can detect, and when your baby may need one.

What Is a Neonatal Echo Test?

A neonatal echocardiogram is an ultrasound examination used to check the heart of a newborn baby, generally during the first 28 days after birth.

The test uses sound waves to create moving pictures of the heart. These images allow doctors to examine:

• The size and shape of heart chambers

• The structure and movement of heart valves

• Blood flow through the heart

• The heart's pumping function

• Possible holes or other structural abnormalities

Unlike an X-ray, an echocardiogram does not use radiation. It is a non-invasive test and is generally painless.

A pediatric cardiologist examines the images to understand whether the baby's heart is developing and functioning as expected.

Why Can Some Heart Defects Be Missed During Pregnancy?

Pregnancy ultrasound scans are important, but they cannot always identify every heart condition.

Several factors can make certain heart defects difficult to detect before birth.

1. Baby's Position During Ultrasound

The baby's position inside the womb can sometimes make it difficult to obtain clear images of the heart.

2. Small Heart Abnormalities

Some heart defects are very small or difficult to distinguish during pregnancy. Certain abnormalities may become easier to identify after delivery.

3. Changes in Blood Circulation After Birth

Before birth, a baby's blood circulation works differently because oxygen comes through the placenta.

After delivery, the lungs begin supplying oxygen, and normal changes occur in the heart and blood vessels. These changes can reveal problems that were less noticeable during pregnancy.

4. Limitations of Routine Pregnancy Scans

A routine pregnancy ultrasound does not provide the same detailed heart assessment as a dedicated fetal echocardiogram.

Even a detailed fetal echo cannot detect every possible heart abnormality.

Which Heart Defects Can a Neonatal Echo Detect?

A neonatal echo can help diagnose several congenital heart defects, including conditions that may not have been identified before birth.

Atrial Septal Defect

ASD is an opening in the wall separating the heart's two upper chambers.

An echo can help doctors identify abnormal blood flow and determine whether further monitoring is needed.

Ventricular Septal Defect

VSD is a hole in the wall between the heart's lower chambers.

An echocardiogram helps doctors examine its location, size, and effect on blood circulation.

Patent Ductus Arteriosus

The ductus arteriosus is a normal blood vessel before birth that usually closes afterward.

If it remains open longer than expected, doctors may use an echo to assess the blood flow and determine whether treatment or observation is appropriate.

Heart Valve Abnormalities

Some babies have heart valves that are unusually narrow, do not open properly, or allow blood to leak backward.

An echo helps examine valve structure and function.

Narrowing of the Aorta

Coarctation of the aorta occurs when part of the body's main artery is narrowed.

This condition can sometimes be difficult to recognise before birth and may become more apparent after delivery.

Important: Not every heart defect requires surgery. Treatment depends on the type of abnormality, its severity, and the baby's overall health.

What Signs May Indicate That a Newborn Needs an Echo?

Some newborns with heart conditions show symptoms soon after birth, while others may initially appear healthy.

Doctors may recommend heart evaluation when they notice:

• Fast or difficult breathing

• Bluish lips or skin

• Poor feeding or difficulty finishing feeds

• Unusual tiredness during feeding

• Poor oxygen saturation readings

• An abnormal heart sound or murmur

• Weak pulses or poor circulation

These symptoms do not always indicate heart disease. Other medical conditions can also cause similar problems.

However, difficulty breathing, blue or grey skin, collapse, or severe feeding difficulty requires immediate medical attention.

A normal pregnancy scan should not delay medical assessment when concerning symptoms appear.

How Is a Neonatal Echo Test Performed?

A neonatal echo is usually performed in a hospital or specialised cardiac assessment setting.

The procedure generally involves the following steps:

Step 1: Preparing the Baby

The baby is placed comfortably on an examination bed, often with a parent nearby.

Step 2: Applying Ultrasound Gel

A small amount of gel is applied to the baby's chest to help transmit sound waves.

Step 3: Examining the Heart

A specialist moves a handheld ultrasound probe gently over the chest to capture moving images.

Step 4: Assessing Blood Flow

Doppler ultrasound may be used to examine the direction and speed of blood moving through the heart.

Step 5: Reviewing the Results

The doctor interprets the findings and explains whether further tests, treatment, or follow-up appointments are needed.

The examination is generally safe and does not involve needles or radiation. Its duration depends on the complexity of the assessment and how settled the baby is.

Is a Neonatal Echo Necessary After a Normal Pregnancy Scan?

Not every newborn requires an echocardiogram.

If a baby is healthy, has a normal physical examination, and shows no concerning findings, doctors may not recommend additional heart imaging.

However, a neonatal echo may be appropriate when:

• A doctor suspects a congenital heart defect

• A newborn has an unusual heart murmur

• Oxygen screening results are abnormal

• Symptoms suggest a possible heart condition

• A previous pregnancy scan raised concerns

• A known cardiac condition needs assessment after birth

Doctors use the baby's medical history, physical examination, and screening results to decide whether the test is needed.

Why Early Detection of Heart Defects Matters

Identifying a significant heart defect early allows doctors to plan suitable care before complications develop.

Early diagnosis may help with:

• Understanding the baby's heart condition

• Deciding whether treatment is necessary

• Planning regular cardiac monitoring

• Identifying conditions requiring urgent intervention

• Guiding parents about follow-up care

Some minor abnormalities improve or close naturally as a child grows. Other conditions may require medication, procedures, or surgery.

Regular medical evaluation helps doctors choose the most appropriate approach for each baby.

Get the Right Heart Assessment for Your Newborn

A normal pregnancy ultrasound is reassuring, but it cannot guarantee that every heart condition has been ruled out.

If your baby's doctor suspects a heart abnormality, a detailed examination after birth can provide important information.

Dr Amitoz Baidwan provides Pediatric and Neonatal Echo services in Mohali, helping families understand their baby's heart health through specialist cardiac evaluation.

If you have concerns about your newborn's heart, consult a qualified pediatric cardiac specialist to determine whether additional testing is appropriate.

Frequently Asked Questions

1. Can a neonatal echo detect heart problems missed during pregnancy?

Yes. A neonatal echo can identify certain structural heart defects and blood flow abnormalities that were not detected during pregnancy. However, no single test can identify every possible heart condition.

2. Is a neonatal echo test safe for newborn babies?

Yes. A neonatal echocardiogram uses ultrasound sound waves rather than radiation. It is generally safe, non-invasive, and painless for newborns.

3. Can a baby have a heart defect even after a normal fetal echo?

Yes. Although a fetal echo provides detailed heart images, some defects may be difficult to detect before birth or may become more apparent afterward.

4. Does every newborn baby need a neonatal echo test?

No. Doctors usually recommend an echo when symptoms, examination findings, screening results, or medical history suggest a possible heart condition.