RSV Baby

RSV in Babies and Toddlers

5 min readUpdated April 17, 2025
Christopher B. Peltier
Medically reviewed by
Christopher B. Peltier
MD, FAAP
Respiratory Syncytial Virus (RSV) is a strange-sounding name for an illness you may not have heard of, but it’s more common than you think. In fact, it’s one of the viruses that can cause cold symptoms. Find out more about RSV and learn how to recognize the signs in infants and babies, as well as how the infection can be treated.

What Is RSV in Babies?

RSV is short for Respiratory Syncytial Virus and is just one of many viruses that can cause a common cold symptoms in babies, children, and adults. In some cases, RSV can lead to bronchiolitis or pneumonia in children younger than 1 year old.

How Common Is RSV in Babies?

RSV is most common in babies between 2 and 8 months of age, and in infants and young children, RSV is the most common cause of lower respiratory tract infections. 
In fact, RSV is so common that nearly all children get the infection by the time they reach 3 years old. Luckily, in most cases, it will only cause an upper respiratory infection and have cold-like symptoms. For a smaller number of children, the RSV infection may lead to a lower respiratory infection (bronchiolitis), which may need medical care.
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Signs and Symptoms of RSV in Babies

The upper respiratory (cold-like) symptoms of an RSV infection can include:
  • Runny or stuffy nose
  • Sneezing
  • Sore throat
  • Mild cough 
  • Mild headache
  • Fever
  • Fussiness
  • Poor feeding.

How Is RSV Diagnosed?

If you suspect your little one has the symptoms of RSV or another respiratory infection, call your child’s healthcare provider. You may be asked to describe their symptoms and take them in for a physical exam. 
In some cases, to help make a diagnosis, the provider may swab your baby’s nose for a sample to test for the RSV virus or order an X-ray to check for pneumonia.

How Do Babies Get RSV?

RSV is highly contagious and usually occurs from October through March, which is the cold and flu season. RSV transmission can occur through saliva droplets when someone coughs or sneezes. It can live on surfaces like countertops for up to six hours and on your hands for up to 30 minutes or even longer. Your child can get infected after touching anything that has been contaminated and then touching their mouth, nose, or eyes.
The RSV virus can spread quickly at daycare centers and schools. Your baby can easily get it at daycare or from an older sibling who carries the virus home from school.
Keep in mind that if your baby has an RSV infection, they can spread it through direct contact with anyone. Someone who kisses your little one's face, for example, could potentially pick up the virus. 

What Are the Causes of RSV?

RSV is caused by a viral infection that primarily affects the respiratory system. As we mentioned above, it spreads through contact with respiratory droplets from an infected person, making it highly contagious, especially in crowded or close-contact settings like daycare. 

How Serious is RSV?

If the RSV infection spreads to the lower respiratory tract, it can lead to bronchiolitis, an infection of the small airways of the lungs. It's not the same illness as bronchitis, which is an infection of the larger airways of the lungs. The symptoms of bronchiolitis include:
  • Rapid breathing
  • Wheezing
  • Flaring of the nostrils
  • Head bobbing or rhythmic grunting while breathing
  • Breathing from the belly or retracted breathing between the ribs or lower neck.
Infants may be at a higher risk of severe RSV if they can be described as any of the following:
  • A newborn younger than 12 weeks old during RSV season (from fall to spring)
  • A baby who was born prematurely or at a low birth weight
  • A baby with chronic lung disease
  • A baby with congenital heart disease
  • A baby with cystic fibrosis
  • A baby with a weakened immune system due to an illness
  • A baby with a history of allergies or eczema.

How Long Does RSV Last in Babies?

The RSV infection can last from one week to several weeks, depending on its severity.

Are There Long-Term Side Effects of RSV?

Most babies recover fully from RSV without any lasting effects. However, in some cases, especially if the infection was severe, there may be a few long-term side effects. These may include an increased risk of developing wheezing or asthma-like symptoms later in childhood.

Can You Get RSV More Than Once?

If you’re wondering whether you can get RSV multiple times, the answer is yes. It’s possible to get infected with RSV again, even during the same season. In general, the symptoms may be less severe than the first infection, but it’s a good idea to keep an eye on your baby's symptoms as their immune systems are usually weaker than adults. Check out our section on When Should You Contact Your Baby’s Healthcare Provider? for symptoms to watch out for.

RSV Treatment

There is no medication to treat an RSV infection, which is a viral infection. Antibiotics would not be prescribed because antibiotics are effective only for bacterial infections. 
However, there are some things you can do at home to ease your child’s symptoms and help your little one feel more comfortable:
  • Use a cool mist humidifier, saline nasal drops, or a nasal aspirator if your child has a stuffy nose
  • If your child has a cough, don’t give cough suppressant medicine since the coughing can actually help clear their lungs of the infection. You can use honey, but only if your child is older than 12 months of age.
  • If your child has a fever, check with their healthcare provider about giving a fever-reducing medicine-like acetaminophen.  Babies older than 6 months can also take ibuprofen
  • Make sure your child is getting enough fluids to prevent dehydration.
If your baby has a more severe case of RSV, the healthcare provider may give your little one medication via a nebulizer to help open up the breathing tubes. This approach can help some babies and may prevent the need for hospitalization.
If the RSV infection has resulted in bronchiolitis, your baby’s provider may recommend hospitalization, especially if your little one is having trouble breathing, eating, or drinking. 

How to Prevent RSV in Babies

Although you can’t completely protect your baby from infections like RSV, there are some simple steps you can take to reduce your little one’s risk of coming into contact with the RSV virus and getting infected:
  • Have all family members, caregivers, and visitors who come into contact with your baby wash their hands with soap and warm water for at least 20 seconds before holding your baby. If soap and water are not available, an alcohol-based hand sanitizer works well, too.
  • Avoid having your baby come into contact with people who have cold-like symptoms, such as a runny nose.
  • Limit contact with siblings or other children who have cold symptoms and ensure that they wash their hands often. 
  • Regularly disinfect common objects and surfaces in your home, like doorknobs, toys, and kitchen counters, to cut down on germs.
  • Whenever possible, avoid visiting crowded areas like shopping malls or entering enclosed spaces like elevators, where your baby could come in contact with ill people
  • Don’t smoke around your baby, as this can increase their risk of getting an RSV infection.
  • Keep your baby up to date on immunizations and ensure your entire family gets the flu shot every year. The Tdap vaccine protects against whooping cough is especially important for family members who come into contact with your child.
  • If you are breastfeeding, you might like to know that breastfeeding can pass on protective antibodies to your baby that can help prevent and fight infectious diseases such as RSV. In fact, breastfeeding while you have a cold may even help your baby by passing on more antibodies.

RSV Immunizations?

  • Pregnant women can receive the RSV vaccine between weeks 32-36 of their pregnancy. The vaccine results in the production of antibodies against RSV, that will be transferred to your baby to protect them against RSV.  
  • If you did not receive the RSV vaccine during your pregnancy, infants can receive passive RSV immunization with nirsevimab (Beyfortus) or palivizumab (Synagis).
  • These immunizations help to lessen the severity of RSV infection and prevent hospitalization. 

When Should You Contact Your Baby’s Healthcare Provider?

Contact your child’s healthcare provider as soon as you can if you observe any of these behaviors or symptoms in your baby:
  • They wheeze when they inhale or exhale
  • Their chest retracts around the ribs and breastbone while breathing (the chest or muscles between or under the rib cage suck in and out). 
  • They can’t drink fluids because they are unable to suck and swallow 
  • Their lips or fingertips are turning a bluish color 
  • They have a fever that lasts more than three days (or they are under 3 months old with any fever)
  • They are showing signs of dehydration, such as a dry mouth, drinking less fluid than normal, being unable to cry tears, or urinating less than normal (you might notice fewer wet diapers, for example).

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The Bottom Line

The RSV virus is one of the viruses that your little one may catch. Typically, it causes only cold-like symptoms and will resolve within a few days or weeks, but in some cases, it can lead to complications and even require hospitalization.
Good hygiene habits like regular handwashing, disinfecting surfaces, and keeping your baby away from anyone who has cold-like symptoms can help prevent your child from becoming infected with RSV. There are also immunizations for both mom and baby that can prevent more serious RSV infections.
But if your little one does catch it, some simple at-home TLC will likely work to get them back to health in no time. If your child has more severe symptoms, the healthcare provider will be able to make a diagnosis and recommend the next steps in treatment.
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The information in this article is based on the expert advice found in trusted medical and government sources, such as the American Academy of Pediatrics and the American College of Obstetricians and Gynecologists. You can find a full list of sources used for this article below. The content on this page should not replace professional medical advice. Always consult medical professionals for full diagnosis and treatment.

About Christopher B. Peltier

Pediatrician at Pediatric Associates of Mount Carmel, Inc.; Cincinnati, OH

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