Transposition of the Great Arteries (TGA) in Babies
Medically reviewed by Dr. Michael Okonkwo, MD, FAAP · Board-Certified Neonatologist
Content reviewed against published CDC, AAP, AHA guidelines
Last reviewed:
If your baby has been diagnosed with or you suspect transposition of the great arteries (tga) in babies, here is what the evidence says.
The short answer
Transposition of the great arteries (TGA) is a critical congenital heart defect where the two major blood vessels leaving the heart are switched -- the aorta connects to the right ventricle and the pulmonary artery connects to the left ventricle. This means oxygen-poor blood circulates to the body while oxygen-rich blood recirculates to the lungs, causing severe cyanosis (blue coloring) shortly after birth. TGA requires an urgent procedure called a balloon atrial septostomy to mix blood, followed by corrective surgery (the arterial switch operation), usually within the first 1-2 weeks of life. With modern surgical techniques, outcomes are excellent and most children lead normal, active lives.
Key takeaways
- Transposition of the great arteries (TGA) is a critical congenital heart defect where the two major blood vessels leaving the heart are switched -- the aorta connects to the right ventricle and the pulmonary artery connects to the left ventricle. This means oxygen-poor blood circulates to the body while oxygen-rich blood recirculates to the lungs, causing severe cyanosis (blue coloring) shortly after birth. TGA requires an urgent procedure called a balloon atrial septostomy to mix blood, followed by corrective surgery (the arterial switch operation), usually within the first 1-2 weeks of life. With modern surgical techniques, outcomes are excellent and most children lead normal, active lives.
- Usually normal when: Your baby has been evaluated and their heart anatomy is confirmed to be normal
- Call your doctor if: Your newborn is blue or gray, especially around the lips, tongue, and trunk -- this is a medical emergency, call 911
- Varies by age — see the age-by-age breakdown below
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What Parents Should Know
According to CDC, AAP, AHA guidelines, transposition of the great arteries (TGA) is a critical congenital heart defect where the two major blood vessels leaving the heart are switched -- the aorta connects to the right ventricle and the pulmonary artery connects to the left ventricle. This means oxygen-poor blood circulates to the body while oxygen-rich blood recirculates to the lungs, causing severe cyanosis (blue coloring) shortly after birth. TGA requires an urgent procedure called a balloon atrial septostomy to mix blood, followed by corrective surgery (the arterial switch operation), usually within the first 1-2 weeks of life. With modern surgical techniques, outcomes are excellent and most children lead normal, active lives. At Prenatal, tGA may be detected on a fetal echocardiogram, though it can be more difficult to identify on routine prenatal ultrasound than some other heart defects. When diagnosed prenatally, delivery is planned at a hospital with a pediatric cardiac surgery program. This allows for immediate stabilization of the baby after birth. Prenatal diagnosis significantly improves outcomes by ensuring the right team and resources are ready. It is generally considered normal when your baby has been evaluated and their heart anatomy is confirmed to be normal. However, you should contact your pediatrician promptly if your newborn is blue or gray, especially around the lips, tongue, and trunk -- this is a medical emergency, call 911.
Normal vs. Concerning
When to Seek Immediate Care
- Your newborn is blue or gray, especially around the lips, tongue, and trunk -- this is a medical emergency, call 911
- Your baby after TGA repair develops new breathing difficulty, poor feeding, swelling, or blue coloring
- Your baby has a low pulse oximetry reading (below 95% in both hands and feet) -- seek immediate medical evaluation
By Age
What to expect by age
Prenatal
TGA may be detected on a fetal echocardiogram, though it can be more difficult to identify on routine prenatal ultrasound than some other heart defects. When diagnosed prenatally, delivery is planned at a hospital with a pediatric cardiac surgery program. This allows for immediate stabilization of the baby after birth. Prenatal diagnosis significantly improves outcomes by ensuring the right team and resources are ready.
0-48 hours
Babies with TGA typically develop cyanosis (blue skin, lips, and nails) within the first hours of life, as the ductus arteriosus begins to close. Oxygen saturation levels will be low despite the baby otherwise appearing vigorous. The baby will be started on prostaglandin to keep the ductus open and may need a balloon atrial septostomy (a catheter-based procedure to create or enlarge a hole between the atria to allow mixing of blood). This stabilizes the baby until definitive surgery.
1-2 weeks
The arterial switch operation (ASO), also known as the Jatene procedure, is typically performed within the first 1-2 weeks of life. During this surgery, the aorta and pulmonary artery are moved to their correct positions and the coronary arteries are reimplanted. This is open-heart surgery requiring cardiopulmonary bypass. Recovery in the hospital typically takes 2-4 weeks. The arterial switch operation has a success rate exceeding 95% at experienced centers.
1-12 months post-surgery
After the arterial switch operation, babies are monitored closely for complications including narrowing at the surgical connection sites and coronary artery issues. Most babies recover well, feed normally, and gain weight appropriately. Regular cardiology follow-up with echocardiography is essential. Parents may be reassured that the repaired heart is now structurally very close to normal, with two pumping chambers and correctly connected great arteries.
Long-term
Most children after a successful arterial switch operation lead normal, active lives with no significant restrictions. Long-term follow-up with a cardiologist is recommended, typically annually, to monitor for late complications such as aortic valve regurgitation or coronary artery stenosis. Most children can participate fully in sports and physical activities. Developmental outcomes are generally excellent.
What to Tell Your Pediatrician
- Describe when you first noticed transposition of the great arteries (tga) in babies and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if a prenatal ultrasound raises any concern about the position of the great arteries or heart anatomy.
- Mention if your baby after TGA repair seems to tire more easily during feeds or activities than expected.
- Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
- Bring a list of any questions or observations you want to discuss at the appointment.
What Should You Do?
When to take action
- Your baby has been evaluated and their heart anatomy is confirmed to be normal
- Your child had a successful arterial switch operation and their cardiologist confirms the heart is functioning well at follow-up
- Your baby briefly appeared bluish around the hands and feet in the first day of life but pulse oximetry screening was normal (acrocyanosis)
- A prenatal ultrasound raises any concern about the position of the great arteries or heart anatomy
- Your baby after TGA repair seems to tire more easily during feeds or activities than expected
- Your child after TGA repair has not had a cardiology follow-up in over a year
- Your newborn is blue or gray, especially around the lips, tongue, and trunk -- this is a medical emergency, call 911
- Your baby after TGA repair develops new breathing difficulty, poor feeding, swelling, or blue coloring
- Your baby has a low pulse oximetry reading (below 95% in both hands and feet) -- seek immediate medical evaluation
What You Can Do at Home
- Keep track of when you notice transposition of the great arteries (tga) in babies — noting the time of day, duration, and any triggers can help your pediatrician.
- Remember that your baby has been evaluated and their heart anatomy is confirmed to be normal — this is generally within the range of normal.
- At Prenatal, focus on observation rather than intervention unless your pediatrician advises otherwise.
- Follow any care instructions from your pediatrician. Keep a written log of symptoms to bring to appointments.
- While monitoring at home, seek immediate care if your newborn is blue or gray, especially around the lips, tongue, and trunk -- this is a medical emergency, call 911.
Related Conditions
Congenital Heart Defect Signs in Babies
Congenital heart defects (CHDs) are the most common type of birth defect, affecting about 1 in 100 babies. They range from small holes in the heart that may close on their own to complex defects requiring multiple surgeries. Early detection through pulse oximetry screening and recognizing key signs — such as blue skin, rapid breathing, poor feeding, and failure to gain weight — is critical. Advances in surgery have dramatically improved survival and quality of life.
My Baby Turns Blue (Cyanosis)
Blue or purple discoloration limited to a baby's hands and feet (acrocyanosis) is very common in newborns and usually harmless, caused by immature circulation. However, blue coloring of the lips, tongue, face, or trunk (central cyanosis) is always a medical emergency that requires immediate evaluation, as it may indicate a heart or lung problem.
Baby Heart Murmur - Innocent vs Concerning
Heart murmurs are very common in children - up to 75% of children will have an audible murmur at some point. The vast majority are "innocent" or "functional" murmurs, meaning there is no structural heart problem. These murmurs are simply the sound of blood flowing normally through the heart and are more audible during fever, illness, or excitement. A smaller number of murmurs indicate a structural heart difference that may need monitoring or treatment. Your pediatrician can usually distinguish between the two and will refer for an echocardiogram if there is any concern.
Tetralogy of Fallot in Babies
Tetralogy of Fallot (TOF) is the most common cyanotic (blue) congenital heart defect, affecting about 1 in 2,500 babies. It involves four heart abnormalities that together reduce blood flow to the lungs and cause oxygen-poor blood to flow to the body. Most babies undergo complete surgical repair between 3-6 months of age, and the long-term outlook after repair is excellent, with most children leading active, normal lives.
Related Resources
Frequently asked questions
Is transposition of the great arteries (tga) in babies normal?
When should I call the doctor about transposition of the great arteries (tga) in babies?
When is transposition of the great arteries (tga) in babies normal?
What causes transposition of the great arteries (tga) in babies?
What should I mention to my pediatrician about transposition of the great arteries (tga) in babies?
Is transposition of the great arteries (tga) in babies normal at Prenatal?
Is transposition of the great arteries (tga) in babies normal at 0-48 hours?
Should I go to the ER for transposition of the great arteries (tga) in babies?
Does transposition of the great arteries (tga) in babies go away on its own?
References
Doctor Visit Checklist
Bring this checklist to your next pediatrician visit to discuss Transposition of the Great Arteries (TGA) in Babies.
Things to mention
- Describe when you first noticed transposition of the great arteries (tga) in babies and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if a prenatal ultrasound raises any concern about the position of the great arteries or heart anatomy.
- Mention if your baby after TGA repair seems to tire more easily during feeds or activities than expected.
- Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
- Bring a list of any questions or observations you want to discuss at the appointment.
Observations to share
- A prenatal ultrasound raises any concern about the position of the great arteries or heart anatomy
- Your baby after TGA repair seems to tire more easily during feeds or activities than expected
- Your child after TGA repair has not had a cardiology follow-up in over a year
Urgent signs to report immediately
- Your newborn is blue or gray, especially around the lips, tongue, and trunk -- this is a medical emergency, call 911
- Your baby after TGA repair develops new breathing difficulty, poor feeding, swelling, or blue coloring
- Your baby has a low pulse oximetry reading (below 95% in both hands and feet) -- seek immediate medical evaluation
My notes
From ismybabyalright.com — free, evidence-based baby health guides
All content follows our editorial policy and is reviewed against published clinical guidelines.
2,705 evidence-based guides6 authoritative medical sources5 medical advisory board members
Related Resources
Bottom line
Most cases of transposition of the great arteries (tga) in babies are normal. Talk to your pediatrician if your newborn is blue or gray, especially around the lips, tongue, and trunk -- this is a medical emergency, call 911.
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.
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Related Medical Concerns
Congenital Heart Defect Signs in Babies
Congenital heart defects (CHDs) are the most common type of birth defect, affecting about 1 in 100 babies. They range from small holes in the heart that may close on their own to complex defects requiring multiple surgeries. Early detection through pulse oximetry screening and recognizing key signs — such as blue skin, rapid breathing, poor feeding, and failure to gain weight — is critical. Advances in surgery have dramatically improved survival and quality of life.
My Baby Turns Blue (Cyanosis)
Blue or purple discoloration limited to a baby's hands and feet (acrocyanosis) is very common in newborns and usually harmless, caused by immature circulation. However, blue coloring of the lips, tongue, face, or trunk (central cyanosis) is always a medical emergency that requires immediate evaluation, as it may indicate a heart or lung problem.
Baby Heart Murmur - Innocent vs Concerning
Heart murmurs are very common in children - up to 75% of children will have an audible murmur at some point. The vast majority are "innocent" or "functional" murmurs, meaning there is no structural heart problem. These murmurs are simply the sound of blood flowing normally through the heart and are more audible during fever, illness, or excitement. A smaller number of murmurs indicate a structural heart difference that may need monitoring or treatment. Your pediatrician can usually distinguish between the two and will refer for an echocardiogram if there is any concern.
Tetralogy of Fallot in Babies
Tetralogy of Fallot (TOF) is the most common cyanotic (blue) congenital heart defect, affecting about 1 in 2,500 babies. It involves four heart abnormalities that together reduce blood flow to the lungs and cause oxygen-poor blood to flow to the body. Most babies undergo complete surgical repair between 3-6 months of age, and the long-term outlook after repair is excellent, with most children leading active, normal lives.
My Baby's Head Shape Looks Abnormal
Many babies develop temporary head shape irregularities that are completely normal. A cone-shaped head from vaginal delivery reshapes within days. Mild positional flattening (plagiocephaly) from sleeping on the back is very common and usually improves with repositioning and tummy time. However, head shape changes involving ridges, a persistently bulging fontanelle, or rapid head growth changes should be evaluated to rule out craniosynostosis.
Achondroplasia (Dwarfism) in Babies
Achondroplasia is the most common form of short-limbed dwarfism, affecting about 1 in 15,000 to 40,000 births. It is caused by a mutation in the FGFR3 gene and is usually apparent at birth with characteristic features including short limbs, a larger head, and a prominent forehead. Intelligence is normal. With monitoring for specific complications and supportive care, children with achondroplasia lead full, active, and independent lives.