Seeing your baby breathe faster than usual when they have a fever can be unsettling, especially when it happens in the middle of the night. A fever can naturally make breathing quicker, but sometimes it can also be a sign that your baby is having a harder time breathing.
If you notice your baby breathing fast with a fever, take a closer look at how their chest and tummy move while they're calm or asleep. Counting their breaths for a full 60 seconds and watching for signs like skin pulling inward around the ribs, flaring nostrils, or grunting can give you a better idea of what's going on. Our baby fever guide also covers other symptoms to look out for and when to contact your pediatrician.
Key Takeaways
- Fever and Fast Breathing: Fever can make your baby breathe faster, but persistent rapid breathing may also signal a respiratory infection.
- Counting Breaths: Count for a full 60 seconds while your baby is calm. A breathing rate of 60 breaths/minute (under 2 months), 50 (2–11 months), or 40 (12–59 months) or higher is considered fast for these age groups.
- Warning Signs: Watch for chest retractions, flaring nostrils, grunting, or difficulty feeding. Blue lips, breathing pauses, or difficulty waking require emergency care.
- Young Baby Fever: Babies under 3 months with a rectal temperature of 100.4°F (38°C) or higher need immediate medical evaluation.
Why Your Baby May Breathe Faster With a Fever
Watching an infant pant during a fever spike unnerves any parent. Yet, rapid breathing is often the body's natural radiator at work. Doctors call this fast, fever-driven tempo febrile tachypnea.
Why does a baby breathe fast when they have a fever?
Fever raises cellular metabolism by 10%–12% per 1°C (1.8°F) rise in temperature. To meet higher oxygen needs and blow off body heat through evaporative cooling, an infant's brainstem automatically increases breathing by 7 to 10 breaths per minute.
When your baby's temperature goes up, their body works a little harder than usual, and you may notice their breathing becoming quicker too. This is sometimes called febrile tachypnea, which simply means faster breathing associated with a fever.
You might notice this change more when the fever is rising. However, fever isn't the only reason babies breathe quickly, so it's worth looking at how comfortably they're breathing rather than focusing on the number alone.
Some babies also experience chills or have cooler hands and feet while running a fever. These changes can happen as the body adjusts its temperature. Our guide to pediatric fever emergency warning signs explains which other symptoms deserve attention.
If your baby's fever appears after routine vaccinations, our guide to treating baby fever after immunization covers common reactions and ways to keep your little one comfortable. Still, fast or difficult breathing shouldn't automatically be attributed to a recent vaccination.
How to Count Your Baby's Breaths
To check your baby's breathing rate, count chest rises only when they are quiet or asleep. Unsnap their sleepwear in a warm room so you can see their tummy clearly. Crying, nursing, or wiggling will instantly skew your count.
It's best to count for a full 60 seconds rather than counting for 15 seconds and multiplying by four. Babies can have slightly irregular breathing patterns, with short pauses followed by quicker breaths, so a full-minute count gives you a more reliable reading.
| Pediatric Age Group | Normal Resting Rate | WHO Tachypnea Cutoff | Clinical Significance & Action |
| Neonates (< 2 Months) | 30 to 50 breaths/min | ≥ 60 breaths/min | High infection risk; requires immediate emergency hospital evaluation. |
| Infants (2 to 11 Months) | 25 to 40 breaths/min | ≥ 50 breaths/min | Sensitive marker for lower airway illness; check for chest indrawing. |
| Toddlers (12 to 59 Months) | 20 to 30 breaths/min | ≥ 40 breaths/min | Points to airway reactivity or pneumonia; evaluate post-fever breathing. |
Fast Breathing or Trouble Breathing? Signs Parents Should Watch For
Counting your baby's breaths is a useful starting point, but it doesn't tell the whole story. The way their chest, tummy, and face move can give you a better idea of whether they're breathing comfortably or working harder than usual.
Signs of Increased Breathing Effort: What Chest Retractions Look Like
Babies naturally breathe with their tummies, so seeing the belly rise and fall is perfectly normal. What you want to look out for is skin pulling inward around the ribs or neck with each breath.
This is called chest retractions, and it happens when your baby has to work harder to draw air into their lungs. Depending on where you notice it, you may see:
- Under the ribs (subcostal retractions): The area just below the ribcage pulls inward with each breath.
- Between the ribs (intercostal retractions): The skin between the ribs sinks inward, making the ribs look more noticeable.
- At the base of the neck (suprasternal retractions): The soft area above the breastbone dips inward when your baby breathes in.
These movements are not something to brush off, especially when the skin around the ribs and neck pulls inward repeatedly. Have your baby assessed urgently rather than waiting for the fever to settle. You can read more in our guide to whether a baby can get a 103°F fever from teething.
Other Warning Signs: Grunting, Nasal Flaring, and Head Bobbing
Sometimes breathing difficulties show up in small changes that are easy to miss, such as unusual sounds or movements around your baby's face and head.
Listen for a repeated grunting sound when your baby breathes out. This is different from the little snuffles or noises babies sometimes make during sleep. Grunting with each breath can mean your baby is working harder to keep their lungs open and needs urgent medical attention.
Take a look at your baby's face and head, too. Their nostrils may widen with each breath, or their head may move back and forth as they struggle to draw in air.
Another sign to recognize is seesaw breathing. Instead of the chest and tummy moving in their usual pattern, the chest pulls inward while the tummy pushes outward with each breath. This unusual movement can indicate significant breathing difficulty and requires emergency medical care.
If you notice these signs, don't wait to see whether they disappear after your baby's fever comes down. Blue or grey lips, pauses in breathing, or difficulty waking are particularly serious signs that need emergency help. Our guide on when to take a baby to the ER for fever covers other symptoms that shouldn't be ignored.
Common Respiratory Illnesses That Can Cause Fever and Fast Breathing in Babies
Sometimes a little runny nose or cough turns into something more, and you may start noticing that your baby is breathing faster than usual. Respiratory infections are a common reason for this, especially during cold and flu season. Some stay mild, while others can affect the smaller airways and make breathing more difficult.
What respiratory illnesses cause fast breathing and fever in babies?
One common cause is bronchiolitis, usually linked to Respiratory Syncytial Virus (RSV). Other possibilities include viral or bacterial pneumonia, which affects the lungs, and croup, an infection that causes swelling in the upper airway and often comes with a barking cough.
RSV and Bronchiolitis: When a Common Cold Gets Worse
RSV can start out looking like an ordinary cold. Your baby might have a stuffy nose, a runny nose, a mild fever, or an occasional cough. At first, it may not seem like anything out of the ordinary.
As the infection progresses, the cough may become more frequent, and breathing can start to look faster or more labored. That's because bronchiolitis affects the small airways in the lungs, where swelling and extra mucus make it harder for air to move comfortably.
RSV symptoms often get worse before they get better, with many babies reaching their most uncomfortable stage around days 3 to 5. Keep an eye on their breathing and feeding during this time, even if the first few days seemed fairly mild.
What to Watch for as Your Baby's Fever Comes Down
As your baby's fever settles, their breathing may become slower too. That's helpful to notice, but a lower temperature doesn't necessarily mean the respiratory infection has cleared.
Take a moment to look at how your baby is doing overall. Are they breathing comfortably, feeding as usual, and responding normally when awake? These everyday changes can tell you quite a bit about how they're feeling.
Follow your pediatrician's advice on fever medicine and other comfort measures, and continue offering regular feeds while your baby rests. Our guide to reducing baby fever naturally shares some gentle ways to keep your little one comfortable.
Unusual sleepiness or difficulty waking deserves extra attention, too. If you're unsure what normal tiredness looks like during an illness, our guide to recognizing lethargy in a baby with fever explains what parents should watch for.
If fast breathing continues while your baby is resting, contact your pediatrician for advice rather than assuming it's simply part of the fever.
When to Call 911, Visit the ER, or Contact Your Pediatrician
When your baby's breathing changes, knowing who to contact and how quickly to act can feel confusing. Some symptoms need emergency help right away, while others are worth discussing with your pediatrician. Here's how to tell the difference.
Emergency Warning Signs: When to Call 911 or Go to the ER
There are certain changes in your baby's breathing that you shouldn't wait and watch at home. If your little one is struggling to breathe, turning blue, or becoming unusually difficult to wake, they need emergency help.
Call 911 right away if you notice:
- Blue or grey lips and tongue: A blue or grey color on the lips, tongue, or gums can mean your baby isn't getting enough oxygen. This is different from having cool hands or feet.
- Breathing pauses: Your baby stops breathing, especially if they also become limp or change color.
- Severe breathing difficulty: Your baby is struggling with every breath or seems too exhausted to cry normally.
- Unresponsiveness: Your little one is unusually floppy, difficult to wake, or barely responds when you try to comfort them.
Other breathing changes also need urgent medical attention. Watch for skin pulling inward around the ribs or neck, repeated grunting, or a high-pitched sound when your baby breathes in (stridor) while resting.
Young babies need a little extra attention when they have a fever, too. If your baby is under 3 months old and has a rectal temperature of 100.4°F (38°C) or higher, they need immediate medical evaluation, even if they don't seem particularly uncomfortable.
If your baby is having severe trouble breathing, call emergency services rather than trying to drive them to the hospital yourself. It's always better to get help straight away.
When to Contact Your Pediatrician: Nasal Congestion and Keeping Baby Hydrated
Not every change in breathing means an emergency, but that doesn't mean you should ignore it. Persistent fast breathing, changes in feeding, or unusual tiredness are all reasons to check in with your pediatrician.
A stuffy nose can make everyday things like nursing, taking a bottle, and settling down for a nap much harder. If congestion is bothering your little one, our guide to managing baby congestion and recognizing warning signs shares some gentle ways to clear their nose.
A few drops of saline nasal solution can loosen dried mucus, making it easier to remove with a clean bulb syringe or baby nasal aspirator. Gentle suction around the opening of the nostril is usually enough, particularly before feeding when your baby is having trouble breathing comfortably through their nose. Try not to suction too often, as this can irritate the delicate nasal lining.
Keep offering breast milk or formula throughout the day, even if your baby prefers smaller feeds more often. When they're feeling unwell, feeding can take a little more effort, so it's worth keeping an eye on how much they're drinking and how often they're having wet diapers.
If your baby also has diarrhea, fluid loss can become another concern. Fewer wet diapers, a dry mouth, or difficulty keeping feeds down are signs worth discussing with your pediatrician. Our guide to fever and diarrhea in babies explains what to watch for during a stomach bug.
Choosing Comfortable Sleepwear for a Baby with Fever and Fast Breathing
When your baby isn't feeling well, even bedtime can become a little more challenging. You might notice them getting warm and sweaty during sleep or waking up more often than usual. Choosing comfortable sleepwear and keeping extra layers to a minimum can make it easier for your little one to rest.
Choosing Loose Sleepwear and Avoiding Weighted Sleep Products
Your baby's sleepwear should feel comfortable and leave enough room for natural movement. Avoid anything that fits tightly across the chest, as well as weighted swaddles or sleep products, which are not recommended for infant sleep.
If you still use a swaddle, make sure it isn't wrapped too tightly around your baby's chest. However, while your little one is unwell, lightweight sleepwear with their arms free can be a comfortable alternative. Weighted swaddles and weighted sleep products should always be avoided, as they aren't considered safe for infant sleep.
Choosing Breathable Bamboo Sleepwear and Keeping the Nursery Comfortable
When choosing a sleep sack, take the nursery temperature and your baby's clothing underneath into account. A 0.5 TOG sleep sack is a lightweight option for a warmer room, while breathable fabrics can make bedtime feel more comfortable. You can also dress your little one in breathable baby sleepwear made with soft, lightweight fabrics that feel comfortable against their skin.
A nursery temperature around 68°F–72°F (20°C–22°C) can be a useful starting point, but your baby's comfort matters more than following a fixed number. Check their chest or the back of their neck for signs of overheating, such as sweating or feeling unusually hot, and adjust their layers when needed.
Conclusion
It's not always easy to know what to do when your baby is unwell, and some days will naturally feel more worrying than others. Give yourself a little grace as you learn what your baby needs, and remember that reaching out to your pediatrician is always okay when you need reassurance.
You know your baby's usual little habits better than anyone. Trust yourself when something feels different, and don't feel that you have to manage every worry on your own.
