Congenital Cytomegalovirus and Birth Injury Concerns

When a newborn is diagnosed with congenital cytomegalovirus, parents face a flood of medical terms, uncertain prognoses, and questions about what went wrong. Congenital CMV is the most common viral infection passed from a pregnant person to their baby, affecting about 1 in 200 live births. While many infected infants show no symptoms at birth, approximately 1 in 5 will develop serious, lifelong health problems, including hearing loss, vision impairment, seizures, and developmental delays.

This article explains what cCMV is, which birth injuries it can cause, how it’s detected in newborns, and when medical negligence may be a factor in New York. If your child has been diagnosed with cCMV or you’re concerned about symptoms like small head size, jaundice, or hearing concerns, understanding the medical and legal landscape can help you make informed decisions about your family’s care and rights.

What Is Congenital Cytomegalovirus (cCMV)?

Congenital cytomegalovirus is a viral infection a baby acquires before birth when the virus passes from the pregnant person to the fetus. CMV is a member of the herpes virus family and is common in the general population. Many adults carry the virus without knowing it, as it typically causes mild or no symptoms in healthy individuals.

When a pregnant person contracts CMV for the first time during pregnancy, or when a dormant CMV infection reactivates, the virus can cross the placenta and infect the developing baby. The infection can affect multiple organ systems, particularly the brain, ears, eyes, and liver.

How Common Is It?

According to the CDC, about 1 in 200 babies is born with congenital CMV in the United States, and about 1 in 5 of those babies will have birth defects or other long-term health problems. This makes cCMV the most common congenital viral infection, more prevalent than conditions parents may be more familiar with, such as Down syndrome or fetal alcohol syndrome.

Despite its frequency, cCMV is often underdiagnosed because many infected babies appear healthy at birth. About 80% of babies born with cCMV show no symptoms in the newborn period, though some of these children will develop problems later, particularly progressive hearing loss.

How Does a Baby Get Infected?

A baby contracts cCMV when the pregnant person has an active CMV infection during pregnancy. This can happen in two ways:

• Primary infection: The pregnant person contracts CMV for the first time during pregnancy. This poses the highest risk to the fetus, as the body has not yet developed antibodies to control the virus.

• Reactivation or reinfection: A pregnant person who previously had CMV experiences a reactivation of the dormant virus, or contracts a different strain of CMV. While the risk is lower than with primary infection, transmission to the fetus can still occur.

The virus spreads through bodily fluids, including saliva, urine, blood, breast milk, and sexual contact. Pregnant people who have close contact with young children—particularly toddlers in daycare settings—face higher exposure risk, as young children often carry and shed CMV in their saliva and urine without showing symptoms.

What Birth Injuries and Health Problems Can cCMV Cause?

The severity of cCMV varies widely. While most infected babies appear healthy at birth, approximately 1 in 5 will develop serious health issues that can affect them throughout their lives. The timing and severity of the maternal infection, as well as the baby’s immune response, influence outcomes.

Hearing Loss (The Most Common Injury)

Sensorineural hearing loss is the most common and significant injury caused by congenital CMV. It is the leading cause of non-genetic hearing loss in children.

What makes cCMV-related hearing loss particularly challenging is that it can be progressive, meaning it may worsen over time. A baby who passes the newborn hearing screening may develop hearing loss months or years later. This delayed or progressive nature means children with cCMV require ongoing audiological monitoring throughout childhood, even if initial hearing tests were normal.

Hearing loss can range from mild to profound and may affect one or both ears. Early detection is critical because timely intervention with hearing aids, cochlear implants, or speech therapy can significantly improve language development and educational outcomes.

Microcephaly and Brain Development Issues

Microcephaly—a condition in which a baby’s head is significantly smaller than expected for their age and sex—is another serious complication of cCMV. The virus can damage developing brain tissue, leading to reduced brain growth.

Babies with cCMV-related microcephaly often experience neurodevelopmental delays, including:

• Intellectual disability

• Delayed motor skills (sitting, crawling, walking)

• Speech and language delays

• Learning difficulties

You can read more about how a birth injury can lead to developmental delays.

Brain imaging may reveal calcifications (calcium deposits), ventriculomegaly (enlarged fluid spaces in the brain), or other structural abnormalities that indicate the extent of brain injury.

Seizures, Vision Loss, and Cerebral Palsy Links

Congenital CMV can affect other organ systems and neurological functions:

• Seizures: Some infants with cCMV develop seizure disorders that require long-term medication management.

• Vision loss: The virus can cause chorioretinitis (inflammation of the eye’s retina and choroid layer), optic nerve damage, or cortical visual impairment, leading to partial or complete vision loss.

• Neurodevelopmental disorders: Children may experience a range of developmental challenges, from mild learning disabilities to severe intellectual impairment.

Some sources suggest a link between cCMV and cerebral palsy, though the exact relationship and frequency require further verification from primary medical literature. Parents concerned about birth infections and cerebral palsy should discuss their child’s specific risk factors with a pediatric neurologist.

How Is cCMV Detected in Newborns?

Early detection of congenital CMV is essential for timely intervention and monitoring. However, because many infected babies appear healthy at birth, cCMV often goes undiagnosed unless specific testing is performed.

The 24-Hour Newborn Physical Exam

Standard medical practice requires that newborns receive a thorough physical examination within 24 hours of birth. During this exam, clinicians look for signs of congenital abnormalities that may indicate infection or other problems.

For cCMV specifically, clinicians assess:

• Head size and shape: Measuring head circumference to detect microcephaly or signs of hydrocephalus (excess fluid in the brain)

• Jaundice: Yellowing of the skin and eyes, which may indicate liver involvement

• Petechiae: Small red or purple spots on the skin caused by bleeding under the skin

• Enlarged organs: An enlarged liver or spleen detected through palpation

• Neurological responses: Muscle tone, reflexes, and alertness

Signs Clinicians Look For

Certain physical findings during the newborn exam may raise suspicion for cCMV or other congenital conditions:

• Ear abnormalities: Ear pits (small depressions) or ear tags (small pieces of extra skin near the ear) are associated with an increased risk of hearing loss and may prompt additional hearing assessments.

• Small head circumference: A head measurement below the expected range for gestational age may indicate microcephaly and warrant brain imaging.

• Poor feeding or lethargy: Babies who are difficult to rouse or feed poorly may have neurological involvement.

If a clinician suspects cCMV based on physical findings or maternal risk factors, they can order confirmatory testing. The gold standard is a CMV PCR test of the baby’s saliva or urine collected within the first three weeks of life. Testing after three weeks cannot definitively distinguish congenital infection from infection acquired after birth.

Can cCMV Be Prevented or Treated?

Parents often ask whether congenital CMV could have been prevented or whether treatment options exist. The answers depend on multiple factors, including the timing of diagnosis and the severity of infection.

No Vaccine Currently Available

As of now, there is no licensed vaccine to prevent CMV infection in pregnant people. While several vaccine candidates are in various stages of clinical trials, including at least one that has reached Phase 3 testing, none has yet been approved for clinical use. This means prevention relies entirely on behavioral measures rather than immunization.

Hygiene Measures for Pregnant Mothers

Because CMV spreads through bodily fluids, pregnant people can reduce their risk of infection through careful hygiene practices, particularly if they have close contact with young children:

• Wash hands thoroughly with soap and water after changing diapers, wiping a child’s nose or drool, handling children’s toys, or feeding young children

• Avoid sharing food, drinks, or utensils with young children

• Avoid putting a child’s pacifier in your mouth

• Clean toys and surfaces that may have come into contact with children’s saliva or urine

These measures are especially important for pregnant people who work in childcare settings, have toddlers at home, or have other regular contact with young children. However, routine prenatal screening for CMV is not standard practice in the United States, so many pregnant people are not counseled on these preventive steps unless they specifically ask or are identified as high-risk.

Treatment Options for Infected Babies

For babies diagnosed with symptomatic cCMV, antiviral medication may be an option. Valganciclovir, an antiviral drug, has been shown in some studies to improve hearing outcomes and developmental outcomes when started in the first month of life. According to research on cCMV treatment, infants with symptomatic congenital CMV may see the greatest benefit to hearing and neurodevelopmental outcomes when antiviral treatment begins within that first month. Treatment typically lasts six months and requires close monitoring for potential side effects, including low blood counts.

Not all babies with cCMV are candidates for antiviral treatment. The decision depends on the severity of symptoms, the presence of hearing loss, and the risks versus benefits in each individual case. A pediatric infectious disease specialist can help families weigh these considerations.

Supportive care is essential for all affected children. This may include:

• Regular hearing tests and early intervention services for hearing loss

• Physical, occupational, and speech therapy for developmental delays

• Seizure management with appropriate medications

• Vision assessments and support services

When Might cCMV Involve Medical Negligence in New York?

Most cases of congenital CMV are not the result of medical negligence. Because there is no vaccine and routine prenatal screening for CMV is not standard practice in the United States, doctors are not typically expected to prevent or detect every case of cCMV.

However, specific scenarios may give rise to New York birth injury claims when medical providers fail to meet the standard of care.

Failure to Counsel on High-Risk Exposure

If a pregnant person works in a high-risk environment—such as a childcare center, hospital, or other setting with frequent exposure to young children or bodily fluids—and their healthcare provider fails to counsel them on CMV prevention strategies, this may constitute a departure from accepted medical practice.

Similarly, if a pregnant person reports symptoms consistent with a viral infection during pregnancy, or if they have a known high-risk exposure to CMV, a provider’s failure to test for CMV or provide appropriate guidance may be negligent, depending on the specific facts of the case.

Failure to Diagnose Hearing Loss Early

Early detection of hearing loss is critical for language and cognitive development. If a newborn with known cCMV or risk factors for cCMV does not receive appropriate hearing screening, or if abnormal hearing screening results are not followed up promptly, the delay in diagnosis and intervention may harm the child’s developmental trajectory.

New York medical providers are expected to follow established protocols for newborn hearing screening and to ensure timely follow-up when screening results are abnormal or when a baby has risk factors for hearing loss, including congenital infections.

New York’s Birth Injury Statute of Limitations

In New York, the statute of limitations for medical malpractice claims, including birth injury claims, is generally two and a half years from the date of the alleged negligent act, under CPLR 214-a.

For children, this deadline can be extended under New York’s infancy tolling rule, but the extension is not open-ended. Under CPLR 208, the tolling period for a medical malpractice claim cannot extend beyond ten years from the date of the malpractice, which for a birth injury is typically the child’s tenth birthday. This ten-year cap applies regardless of when the child turns 18.

Because these rules are complex and fact-specific, parents concerned about potential medical negligence should consult a New York birth injury attorney as soon as possible to ensure their legal rights are protected. You can read more about how New York’s infant tolling rules apply to birth injury deadlines.

What Should Parents Do If Their Child Has cCMV?

A diagnosis of congenital CMV is overwhelming, but taking immediate steps can help ensure your child receives the care and support they need.

Immediate Medical Steps (Hearing Tests, Developmental Monitoring)

If your child has been diagnosed with cCMV, work with your pediatrician to establish a comprehensive monitoring and care plan:

• Hearing tests: Schedule baseline hearing tests and follow-up assessments at regular intervals, even if initial tests are normal. Because hearing loss can be progressive, ongoing monitoring is essential.

• Developmental assessments: Early intervention services can make a significant difference in developmental outcomes. Request referrals to physical therapy, occupational therapy, and speech therapy as appropriate.

• Vision screening: Ensure your child receives regular eye exams to detect any vision problems early.

• Neurological follow-up: If your child has seizures, microcephaly, or other neurological concerns, establish care with a pediatric neurologist.

Keep detailed records of all medical visits, test results, and treatments. This documentation will be valuable for both ongoing medical care and any potential legal review.

When to Consult a New York Birth Injury Attorney

Not every case of cCMV involves medical negligence, but certain circumstances warrant legal review:

• Your healthcare provider failed to counsel you on CMV prevention despite known high-risk exposures during pregnancy

• Your child’s hearing loss or other symptoms were not diagnosed promptly despite clear signs or risk factors

• You believe your provider ignored symptoms or failed to order appropriate testing when CMV infection was suspected

A qualified New York birth injury attorney can review your medical records, consult with medical experts, and help you understand whether your case may involve a departure from the accepted standard of care. Because New York’s statute of limitations rules are complex, especially for children, consulting an attorney early ensures you don’t lose your right to pursue a claim.

Frequently Asked Questions

Does a Normal Newborn Hearing Screening Rule Out CMV-Related Hearing Loss?

No. CMV-related hearing loss can be progressive, meaning a baby can pass the initial newborn hearing screening and still develop hearing loss months or years later as the infection continues to affect the inner ear. This is why children with confirmed or suspected cCMV need ongoing audiological monitoring throughout early childhood, not just the standard one-time newborn screening. You can read more about newborn hearing screening standards in New York.

Is CMV Testing Part of Routine Newborn Screening in New York?

No. Standard newborn screening panels, including the heel-stick blood test given to all babies, do not test for CMV. Testing only happens if a clinician specifically orders a CMV PCR test based on physical exam findings, maternal risk factors, or a failed hearing screen, which is part of why cCMV is frequently missed unless someone is specifically looking for it. You can read more about what newborn screening tests can and cannot detect.

If My Baby Missed the Three-Week Window for CMV Testing, Can It Still Be Diagnosed?

It becomes much harder. After three weeks of age, a positive CMV test can no longer reliably distinguish an infection present at birth from one acquired afterward through breast milk or other exposure. In some cases, a dried blood spot saved from the newborn screening heel stick can be tested retroactively for CMV, though this isn’t always available or conclusive. Ask your pediatrician or a pediatric infectious disease specialist whether retroactive testing is an option for your child.

Can a Baby with No Symptoms at Birth Still Need Long-Term Monitoring for CMV?

Yes. Most babies with congenital CMV appear healthy at birth, but a portion of these children go on to develop hearing loss or other problems later in childhood. If your baby has a confirmed cCMV diagnosis, even without symptoms at birth, ongoing hearing and developmental monitoring is still recommended rather than a single all-clear assessment.

What Should I Do if I Suspect My Child’s Delayed Diagnosis or Missed Treatment Was Preventable?

Start by requesting your complete prenatal and newborn medical records, including any documentation of symptoms, risk factors, hearing screening results, and testing decisions. A New York birth injury attorney can help you understand whether the delay may reflect a departure from the standard of care and, if needed, connect you with a medical expert to review the timeline. You can read more about what to know about delayed newborn screening and medical malpractice in New York.

Supporting Your Child After a CMV Diagnosis

Congenital CMV is common, and most infected babies grow up without serious complications, but the ones who do face lifelong challenges are often the hardest to catch early since symptoms may not appear until months or years later. Understanding how cCMV is detected, why ongoing hearing and developmental monitoring matters even after a clean initial exam, and what treatment options exist can help you advocate for your child’s care. If you have concerns about how your baby’s CMV was diagnosed or treated, reviewing the medical records with your care team, and if needed, an attorney, can help you understand what happened.