When To Take a Baby With RSV to the Hospital

If your baby has respiratory syncytial virus (RSV), it can be hard to know what’s normal and what’s an emergency.

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RSV is extremely common in infants and young children. In most cases, it looks like a cold. But in babies, especially those under 6 months old, RSV can sometimes lead to breathing trouble that requires emergency care.

So, how do you know when to manage symptoms at home — and when is it time to head to the ER? Pediatrician Kristin Barrett, MD, weighs in.

How to tell if your baby has RSV

RSV usually starts like a typical upper respiratory infection. You might notice:

Runny nose
Cough
Mild fever
Irritability
Decreased appetite

In babies and toddlers, RSV can infect the bronchioles (the small airways in the lungs), causing a condition called bronchiolitis. Those airways are tiny to begin with, and in babies, they’re even tinier. All that swelling and mucus can make it harder for your baby to breathe.

“RSV tends to cause the most issues in babies who are younger than 6 months old, just because of how small their airways are,” Dr. Barrett says. “It really doesn't take much inflammation or mucus for the airways to get closed off.”

Plus, she notes that babies’ symptoms can seem to change quickly because of how mucus moves in and out of their small airways. That fluctuation can make RSV especially nerve-wracking for parents and caregivers.

“It’s really normal to notice some variation in how your baby’s doing, even just hour-to-hour,” she adds.

Most of the time, RSV is mild and can be managed at home with supportive care. But symptoms often get worse before they get better, especially in the first week.

“Keep a close eye on how your child is doing during days three to five of their illness, which are considered peak symptom days,” Dr. Barrett advises. “That way, you’re prepared to act quickly, if needed.”

Key signs to head to the ER

So, how can you tell if you should go to the ER for your baby’s RSV symptoms? Here’s a quick list.

Breathing problems

Dr. Barrett says breathing troubles are the biggest red flag.

“If you see sucking in at their ribs or by their armpit, or if you see their neck and shoulders really having to help them breathe, that almost always needs medical attention urgently,” she emphasizes.

These are known as retractions — when the airways are narrowed or blocked. That causes the skin and muscles to get sucked in around the ribs with each attempted breath.

Dehydration

Dehydration is another symptom that calls for quick medical care.

“If they’re not making tears, their mouth seems dry and they’ve gone more than eight hours without a wet diaper, those are some guidelines that should flag dehydration as a concern,” Dr. Barnett states.

Other symptoms

Other emergency warning signs include:

Flaring nostrils with breathing
Very fast or shallow breathing
Pauses in their breathing
A bluish or gray color around their lips, mouth or fingernails
Severe lethargy or trouble waking up
Signs of dehydration, like no tears when they cry or going more than eight hours without a wet diaper

“RSV can progress quickly in infants because their airways are so small,” Dr. Barrett warns. “If your baby is struggling to breathe, appears blue or gray, or seems unusually unresponsive, seek emergency care immediately.”

When to call the pediatrician

You don’t have to wait for an emergency to check in with your child’s doctor. Call your pediatrician’s office if:

Your baby is very young and has cold-like symptoms
You notice a significant drop in how much they eat
You’re not sure whether their breathing looks normal

Your pediatrician’s office can help you decide whether your baby should continue recovering at home or if they need to be seen for an in-person evaluation.

“If you’re ever in doubt, it’s never going to be the wrong answer to call your pediatrician,” Dr. Barrett says. “Trust your instincts.”

Final thoughts

Breathing troubles, signs of dehydration and changes in color or alertness are all signs that your baby needs urgent medical attention for RSV.

But most babies recover with time and supportive care.

“RSV itself is very common, but severe RSV or complications from it are relatively rare,” Dr. Barrett reassures. “If you’re worried about your baby, or you have questions about RSV, your pediatrician is there to answer them.”