RSV in Babies and Children: Symptoms, Risks, and Emergency Care
Updated: 3 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 17, 2026
Respiratory syncytial virus (RSV) is a common, highly contagious seasonal virus that affects about 90% of children by age two. [1] While it often presents as a mild cold in older children, it is the most common cause of hospitalization in infants in the United States [1], potentially leading to severe lung infections like bronchiolitis and pneumonia. Proactive management includes maintaining hydration and nasal suctioning at home, while emergency signs, such as difficulty breathing or a bluish skin tone, require immediate clinical intervention.
Quick Answer: What is RSV?
RSV is a seasonal respiratory virus that spreads easily through droplets and contaminated surfaces. [1] In infants and toddlers, it can cause swelling of the small airways, leading to fast breathing and wheezing. [1] Most cases are mild and managed at home, but preemies and children with chronic heart or lung disease face higher risk. [1] Struggling to breathe needs emergency care.
What the research says
Most children hospitalized with RSV were previously healthy. In a prospective surveillance study of 5,067 children under 5 in three U.S. counties, 18% had RSV, which accounted for 20% of hospitalizations, 18% of emergency department visits and 15% of office visits for acute respiratory infections from November through April. Hospitalization rates averaged 17 per 1,000 children under 6 months and 3 per 1,000 under 5 years, and only prematurity and young age were independent risk factors (Hall et al., The New England Journal of Medicine, 2009) [2].
Vaccination during pregnancy protected infants from severe RSV illness. In a phase 3 trial of 3,682 vaccinated and 3,676 placebo pregnant women, medically attended severe RSV lower respiratory tract illness within 90 days of birth occurred in 6 infants of vaccinated mothers versus 33 in the placebo group (vaccine efficacy 81.8%; 99.5% CI 40.6 to 96.3), and within 180 days in 19 versus 62 infants (69.4%), with no safety signals identified. The trial gave the vaccine at 24 through 36 weeks of pregnancy (Kampmann et al., The New England Journal of Medicine, 2023) [3].
How does RSV appear in babies and children at different ages?
The impact of respiratory syncytial virus varies significantly depending on a child's age and underlying health status. About 90% of children get RSV before their second birthday, and each year in the U.S. roughly 58,000 to 80,000 children under age five need hospital care for it. [1] For children over age five, the infection typically mirrors a standard common cold, involving congestion, a mild headache, and a cough. [1] However, in younger children, particularly those under age three, the virus often travels deeper into the respiratory tract, causing inflammation in the small airways.
In newborns and infants under six months, the typical 'cold' symptoms may not appear at all. [1] Instead, these very young patients might only exhibit increased irritability, a decreased appetite, or visible changes in their breathing patterns. [1] Recognizing these subtle shifts is essential for early intervention, as RSV is the most common cause of infant hospitalizations in the U.S. [1]
Age Group | Common Symptoms | Potential Complications |
Infants (<1 Year) | Fever (100.4°F+), wet or dry cough, runny nose, congestion, sneezing. | Bronchiolitis; pneumonia; dehydration. |
Toddlers (1–3 Years) | Runny nose, cough, sneezing, decreased eating or drinking, trouble swallowing, faster breathing. | Bronchiolitis; pneumonia; less interest in playing. |
Older Kids (>5 Years) | Congestion, sore throat, mild headache, cough, fever, lack of energy. | Croup (barking cough); wheezing; trouble breathing. |
What are the emergency signs of RSV in infants?
For parents and caregivers, the most critical skill in managing RSV is identifying when the infection has progressed from a mild cold to a respiratory emergency. Severe RSV can lead to bronchiolitis, which causes the small airways in the lungs to swell [1], making it difficult for the child to move air in and out. This condition requires immediate medical attention.
Clinical signs of respiratory distress include 'retractions,' where the chest appears to cave in around the ribs or neck with every breath, and nostril flaring. [1] A blue or gray tint to the lips, mouth, or fingernails [1] is a late sign of low oxygen levels and constitutes a medical emergency. Take your child to the emergency room or call 911 if you notice noisy breathing, grunting, shallow or fast breathing, pauses in breathing, or signs of dehydration. [1]
How does RSV spread, how is it prevented, and who is at risk?
RSV is highly contagious and spreads through respiratory droplets when an infected person coughs or sneezes. [1] The virus can also survive on hard surfaces like toys and tables for several hours [1], making it easy for children to become infected in group settings like daycares or schools. Frequent handwashing and disinfecting shared surfaces are the most effective ways to limit transmission within a household.
Certain children are at a much higher risk for severe RSV complications. This includes infants born prematurely, those under six months of age, children under two with congenital heart or chronic lung disease, and children with a weakened immune system or a neuromuscular disorder. [1] Protection options include the RSV vaccine during weeks 32 to 36 of pregnancy, which protects the infant for the first six months of life [1], and a monoclonal antibody (nirsevimab) that babies up to 8 months old can receive. [1] Some children 8 to 19 months old at higher risk of severe RSV can get nirsevimab before their second RSV season. [1] Your pediatrician can advise which, if any, your baby needs.
How is RSV in babies and children diagnosed and managed?
Healthcare providers typically diagnose RSV through a physical examination and a review of the child's symptoms. In some cases, a nasopharyngeal swab is used to confirm the presence of the virus. [1] If a child requires hospitalization, clinicians may order chest X-rays or blood tests [1] to monitor for complications like pneumonia.
Treatment for RSV is primarily supportive, focused on keeping the child comfortable while the virus runs its course. Most children do not need a specific medication. At-home care involves using nasal aspirators to clear congestion, saline sprays to break up mucus, a cool-mist humidifier, and ensuring the child stays hydrated. [1] Ask your pediatrician before giving any medication, and never give aspirin or cough and cold medicines without their advice. [1] In a hospital setting, care may include oxygen, antiviral medication, or intravenous (IV) fluids, with close monitoring of breathing and oxygen levels. [1]
Conclusion and Next Steps
Most babies and children recover from RSV with supportive care, usually within one to two weeks, with symptoms often at their worst on days three through five. [1] Because RSV can sometimes become serious, knowing the warning signs and the available protection can make a real difference.
Next step: Call your pediatrician if your baby is under 3 months old with a temperature above 100.4°F (38°C), if anyone has a fever above 102°F (39°C), or if symptoms worsen after one week or last longer than 10 to 14 days. [1] Call 911 or go to the nearest emergency room for any struggle to breathe, pauses in breathing, or a blue or gray color to the skin.
Frequently Asked Questions
Is RSV just a common cold?
For many older children, it feels like a cold, but in infants and toddlers, it can lead to serious lung infections like bronchiolitis.
How long does RSV last?
Most children have symptoms for a week or two, often at their worst on days three through five, though a cough may linger longer.
Can my child get RSV more than once?
Yes, it is possible to get RSV multiple times throughout life.
When is RSV season?
RSV is a seasonal virus that spreads most widely during respiratory season, typically in the fall and winter months in most regions.
Is there a vaccine for RSV?
There is a maternal vaccine given during weeks 32 to 36 of pregnancy, and babies up to 8 months old can receive a monoclonal antibody (nirsevimab). Some higher-risk children 8 to 19 months old can get nirsevimab before their second RSV season.
Should I use a humidifier for my child?
Yes, a cool-mist humidifier can help thin mucus and make breathing easier for a congested child.
Can RSV cause a fever?
Yes, a fever of 100.4°F (38°C) or higher is common in infants and children with RSV.
What is bronchiolitis?
Bronchiolitis is an inflammation and swelling of the smallest airways in the lungs, commonly caused by RSV in children under age three.
How can I tell if my baby is dehydrated?
Look for fewer wet diapers, a lack of tears when crying, or a dry mouth and tongue. Signs of dehydration in a baby with RSV need prompt medical attention.
Is RSV dangerous for newborns?
Yes, infants under six months are at the highest risk for severe complications and hospitalization.
Related Reading
What Is RSV? A Plain-Language Guide to the Virus That Acts Like a Cold in Adults but Can Be Dangerous for Babies gives an overview of RSV infection at every age.
Bronchiolitis: Symptoms, Causes, and Treatment explains the small airway infection RSV most often causes in babies.
Croup: The Barking Cough, Symptoms, Causes, Home Care and When to Go to the ER — What Parents Need to Know covers another common breathing illness in young children.
Pneumonia: Complete Guide to Symptoms, Causes, and Treatment explains lung infections, a possible complication of RSV.
References
Cleveland Clinic. RSV in Babies & Children. Cleveland Clinic. January 15, 2024. https://my.clevelandclinic.org/health/diseases/rsv-in-babies-children
Hall CB, Weinberg GA, Iwane MK, et al. The burden of respiratory syncytial virus infection in young children. The New England Journal of Medicine. 2009;360(6):588-598. PMID 19196675. https://doi.org/10.1056/NEJMoa0804877
Kampmann B, Madhi SA, Munjal I, et al. Bivalent prefusion F vaccine in pregnancy to prevent RSV illness in infants. The New England Journal of Medicine. 2023;388(16):1451-1464. PMID 37018474. https://doi.org/10.1056/NEJMoa2216480
Medical disclaimer
The information provided in this article is for educational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.
Comments