Could a Heart Defect Have Been Missed If Your Newborn Turned Blue?

Seeing your newborn’s lips or face turn blue is frightening, and the minutes that follow are usually a blur of staff, monitors, and unanswered questions.

For some families, the explanation that comes later is a congenital heart defect that no one mentioned during the pregnancy. That raises a second, harder question about whether it should have been found sooner.

Sometimes the answer is yes, and often it is no. A blue color has several possible causes, some heart defects cannot be seen before birth even on a careful scan, and screening after birth has known gaps.

This guide explains what a blue color means, how heart defects are looked for before and after delivery in New York, and how to tell an unavoidable late diagnosis from one that deserves a closer look.

What a Blue Color Means in a Newborn

Doctors call a blue or purplish color cyanosis. It appears when the blood is carrying less oxygen than it should. Cyanosis is a sign, and the team’s first job is to find out what is behind it.

Where the color shows up matters a great deal.

• Hands and feet only: Bluish hands and feet in the first day or two are very common, especially when a baby is cool. This is called acrocyanosis, and it is usually harmless.

• Lips, tongue, and face or chest: Blue color in the center of the body is called central cyanosis. It means oxygen levels are low and needs immediate medical attention.

Cyanosis can also be hard to see. It may be subtle in babies with darker skin and is easiest to spot on the lips, tongue, and gums. A baby’s oxygen level can be meaningfully low before any color change is visible, which is one reason hospitals measure it with a sensor instead of relying on appearance.

Causes That Have Nothing to Do With the Heart

Many newborns who turn blue do not have a heart defect. Breathing and circulation problems are frequent causes, and doctors usually evaluate the lungs and heart at the same time.

• Fluid or immature lungs: Leftover lung fluid after delivery and the breathing difficulty that comes with prematurity can both lower oxygen levels.

• Meconium in the airways: A baby who breathes in stool-stained amniotic fluid around delivery can have trouble moving air.

• Infection: Pneumonia and bloodstream infection can cause low oxygen along with poor feeding and temperature changes.

• Circulation that does not switch over: In persistent pulmonary hypertension of the newborn, the blood vessels in the lungs stay tight after birth, so blood bypasses the lungs.

• Other causes: Low blood sugar, seizures, airway blockages, and rare blood conditions can also produce a blue color.

The usual workup includes an oxygen reading, a physical exam, a chest X-ray, and blood tests. If the lungs do not explain the problem, or if oxygen levels stay low even when the baby is given extra oxygen, an ultrasound of the heart called an echocardiogram is the test that answers the heart question.

Heart Defects That Can Cause a Blue Color

Heart defects are the most common type of birth defect. According to CDC data on congenital heart defects, they affect nearly 1 percent of births in the United States, or about 40,000 babies a year, and about 1 in 4 of those babies has a critical defect that needs surgery or another procedure in the first year of life.

The critical defects most associated with a blue color include the following.

• Transposition of the great arteries: The two main arteries leaving the heart are switched, so oxygen-rich blood circulates back to the lungs instead of out to the body.

• Tetralogy of Fallot: A combination of four problems that limits blood flow to the lungs.

• Pulmonary atresia and tricuspid atresia: A valve on the right side of the heart did not form, blocking the normal route to the lungs.

• Total anomalous pulmonary venous return: The veins bringing blood back from the lungs connect to the wrong place.

• Hypoplastic left heart syndrome: The left side of the heart is too small to pump blood to the body.

What Prenatal Ultrasound Can and Cannot Show

The main prenatal check of the heart happens during the anatomy scan, usually performed between 18 and 22 weeks. The sonographer looks at the four chambers of the heart and at the two large arteries leaving it.

That scan finds many serious heart defects, and it also misses a meaningful share of them. Some reasons have nothing to do with the quality of care.

• The baby’s position: A baby lying with the spine toward the probe can hide the heart for an entire appointment.

• The mother’s body and the fluid level: Both affect how clear the images are.

• Defects that develop or change later: Some valve and vessel problems are not apparent at 20 weeks and progress in the third trimester.

• Defects with a normal-looking four-chamber view: Transposition of the great arteries is the classic example. The chambers can look normal, and the problem shows only in the views of the arteries leaving the heart.

Other reasons do relate to care. A scan that never obtained the required heart views and was not repeated, or a report that noted a possible abnormality with no follow-up, is different from a complete scan that looked normal.

Pulse Oximetry Screening in New York

New York requires every birthing facility to screen newborns for critical congenital heart defects using pulse oximetry. The requirement was added to Public Health Law section 2500-a by a law signed in 2013. The test is painless. A small light sensor is wrapped around the baby’s right hand and one foot to read the oxygen level in the blood.

Under the state Department of Health’s screening protocol, the test is done once a baby is at least 24 hours old, or shortly before discharge if the baby is leaving sooner.

• Pass: Readings of 95 percent or higher in both the hand and the foot, with no more than 3 points between them.

• Fail: A reading below 90 percent in either the hand or the foot. The baby needs an immediate clinical assessment.

• In between: The test is repeated in one hour. A second result that does not pass also calls for an immediate assessment.

A failed screen does not mean a baby has a heart defect, since lung problems and infection can lower the reading as well. It does mean the baby should not be discharged until the cause is found.

What the Screen Can Miss

A passed screen lowers the chance of a critical heart defect but does not rule one out. A Cochrane review of pulse oximetry screening found that the test identifies about 76 percent of critical defects. Put another way, of every six babies with a critical heart defect, the screen finds about five and misses one. False alarms are rare.

The defects most likely to be missed are those that obstruct blood flow to the body without lowering oxygen readings early on, such as a narrowing of the aorta. For that reason, the screen is meant to be used alongside a careful newborn exam, and symptoms that appear after a passed screen still need to be taken seriously.

Our guide to what newborn screening tests can and cannot detect looks at the limits of newborn screening more broadly.

How New York Law Applies to a Missed Heart Defect

It helps to start with what a legal claim cannot be about. A congenital heart defect forms early in pregnancy, and no doctor or hospital causes it.

Our guide to the difference between birth defects and birth injuries explains that distinction. Any claim is about the diagnosis and response, and it follows one of two paths.

When a Delay After Birth Caused Added Harm

A baby with an unrecognized critical heart defect can go into shock or have a prolonged period of very low oxygen before treatment starts. That can injure the brain, kidneys, or other organs in ways that would not have happened with a timely diagnosis. A claim for that added harm belongs to the child. The family must show, through qualified medical experts, that the providers departed from accepted standards of care and that the departure was a substantial cause of the additional injury. The defect itself and the surgery it would have required in any case are not part of that claim.

When a Defect Was Missed During Pregnancy

New York treats this situation narrowly. The state’s courts do not allow a child to bring a claim for having been born with a condition. Parents may have a limited claim of their own for the extraordinary costs of caring for the child, and it depends on showing that they were not given information they should have received and that it would have changed their decisions about the pregnancy. These cases turn heavily on individual facts.

Filing Deadlines

The general deadline for medical malpractice in New York is two years and six months under CPLR 214-a. For a child’s own claim, CPLR 208 pauses that clock during infancy, but the extension cannot run more than 10 years from the date of the malpractice.

A parent’s claim is not extended by the child’s age. New York’s highest court held in 2017 that a parent’s claim based on a missed prenatal diagnosis begins to run at the child’s birth, which leaves two years and six months from that date. Claims involving public hospitals also generally require a notice of claim within 90 days.

Our guide to New York’s birth injury statute of limitations and infant tolling rules goes further into these rules, and an attorney should confirm which deadline applies to your family.

Frequently Asked Questions

Is a Heart Murmur in a Newborn Always a Sign of a Defect?

No. Many newborns have a soft murmur in the first days as their circulation adjusts, and most of these fade without treatment. A murmur matters more when it comes with other findings, such as low oxygen readings, fast breathing, poor feeding, or weak pulses in the legs. The reverse is also true. Some serious heart defects produce no murmur at all, so a quiet exam does not rule one out.

What Should Happen After a Failed Pulse Oximetry Screen?

The baby should be examined promptly by a physician or other qualified provider, and should stay in the hospital until the low reading is explained. The team looks for lung problems and infection as well as heart defects. If no other cause is found, an echocardiogram is the next step. A hospital that cannot perform one on site is expected to arrange a transfer or a cardiology consultation.

Would Finding the Defect Before Birth Have Changed the Outcome?

It depends on the defect. A prenatal diagnosis lets the family plan delivery at a hospital with pediatric heart specialists, and lets the team start medication to keep the ductus arteriosus open right after birth. For some defects, that preparation keeps a baby stable before surgery. For others, the treatment and outlook are similar whenever the diagnosis is made. A pediatric cardiologist can explain which applies to your child.

Are Babies Born at Home or in a Birth Center Screened in New York?

They should be. The state Department of Health describes the screening requirement as applying to birthing facilities and to those required to register a child’s birth, which includes providers who attend births outside a hospital. Timing can be harder to arrange, since the screen is done at 24 hours of age or later. If your baby was born outside a hospital, ask your midwife or pediatrician when and where it was performed.

Does One Child’s Heart Defect Raise the Risk for Future Pregnancies?

Somewhat, although most later siblings are born with healthy hearts. The level of risk depends on the type of defect and whether a genetic cause was identified. A prior child with a heart defect is one of the standard reasons to offer a fetal echocardiogram in a later pregnancy. Tell your obstetric provider early, and ask whether a genetic counseling visit makes sense for your family.