That Barking Cough at Night: What to Do Right Now if Your Baby Has Croup and the ER Warning Signs

It's midnight, and your baby, who was sleeping soundly, suddenly wakes up startled, coughing a harsh "bark, bark" like a seal. During the day they seemed fine, but now their voice is hoarse and you hear a rough "wheeze" or high-pitched sound every time they breathe in. In a moment, a parent's heart drops. Not knowing whether to rush to the hospital right now or wait until morning makes it even scarier.

Let's start with the big picture. That distinctive barking cough and hoarse voice is a sound that often appears with croup, which is acute laryngitis. Croup is fairly common in babies from about 6 months to 3 years old, and it usually gets better within a few days. What you can do right now is hold your baby to calm them while letting them breathe cool, moist air. That said, if the breathing is noisy even at rest, if breathing is so hard that the chest or neck pulls in, or if the lips look blue, those are signs to get emergency help without delay — call emergency services or go to the ER. In this article we'll walk through how to recognize croup by its sound, what to do at night, and the emergency warning signs, one by one.

What is croup, and why does it get so much worse so suddenly at night?

Croup usually happens when a virus inflames the larynx below the vocal cords and the entrance of the windpipe, so that area swells and narrows — this is acute laryngitis. In adults this area is wide, so a little swelling isn't noticeable, but a young baby's airway is naturally narrow, so even a little swelling can sharply narrow the passage air travels through. That's why the barking cough, the hoarse voice, and the rough sound on breathing in appear.

One well-known feature is that croup tends to get noticeably worse at night. A baby who coughed a little during the day may have symptoms that stand out once night falls. That's why a baby who seemed fine in the daytime can suddenly get worse around midnight and alarm their parents. There isn't a single clear reason, but just knowing that symptoms tend to stand out at night can help you feel a little more prepared.

Croup is especially common between about 6 months and 3 years. It's a time when the airway is still narrow, so the larynx swells easily with a viral infection. The name sounds frightening, but please remember first that most cases are mild and gradually get better within a few days. Still, the course varies from baby to baby and with how much swelling there is, so please also read below on how to gauge the situation by sound and on the emergency warning signs.

How is a croup cough different from a cold cough?

The quickest clue for recognizing croup in the middle of the night is the sound. If a cold cough feels like a "hack, hack," croup is closer to a "barking" sound, like a seal or a dog. The voice is hoarse too, and a rough "wheeze" or high-pitched sound from the throat as the baby breathes in is characteristic. That rough sound on breathing in is called stridor.

Here's one distinction worth keeping in mind. Croup's stridor is mainly an upper-airway sound (the upper part of the throat) that comes when breathing in. By contrast, the "wheezing" often heard with bronchiolitis or asthma is mainly a lower-airway sound that comes when breathing out, so it's a different kind of sound. Knowing that the location and timing of the sound differ can help you gauge the situation. Here's how they compare in a table.

Feature	Tends toward croup	Tends toward a common cold
Cough sound	Barking, like a dog or seal	Hacking, with a phlegmy sound
Voice	Hoarse or cracked	Usually about the same as usual
Breathing sound	Wheeze/high-pitched sound on breathing in (stridor)	No particular breathing sound
Time of day	Tends to stand out at night	Not much related to time of day
Onset	Sudden, in the middle of the night	Gradual, with a runny nose and mild fever

That said, this table is only a clue to refer to at home; deciding what it actually is is the job of the pediatrician who examines your baby. Especially if the breathing sounds rough or your baby is having trouble breathing, rather than dwelling on telling the sounds apart, please check the emergency signs below first.

What you can do at home tonight

When your child starts barking in the middle of the night, parents tend to panic first, but at this moment calming your baby is the most important thing. When a baby cries and fusses, they breathe faster, and the narrowed airway can become even harder to breathe through. Try the following steps calmly.

1. First, hold your baby and calm them. Hold your baby upright, gently rub their back, and make them as comfortable as possible. Just showing less alarm yourself and soothing them in a low voice can make your baby's breathing noticeably steadier.

2. Let them breathe cool, moist air. Open a window briefly to let them breathe the cool night air, or run warm water in the bathroom to fill it with steam, then hold your baby and stay together for a few minutes in that moist air. This kind of approach is not a treatment that cures croup, but it may help calm your baby and ease the symptoms. Still, it isn't a treatment with solid evidence, so if it doesn't settle things, please seek care rather than just waiting and watching.

3. Hold them upright and keep them hydrated. Breathing is often easier when a baby is held upright than lying down. If your baby wants it, give small, frequent amounts of breast milk, formula, or water to keep their throat moist. Don't force feeding.

4. If there's a fever, care for the fever. A fever can come along with croup. If your baby is uncomfortable with a fever, give fever care suited to their age in months and weight, but be careful with medication. As with fever care after a vaccination, follow the dosing instructions and be cautious.

If your baby settles this way and breathes comfortably, it's often fine to watch through the night and decide the next day whether to see a doctor. But if calming doesn't help or you see the signs below, then head to the hospital right away.

Go to the ER right away if you see these signs

Croup is usually mild, but if the swelling is severe and the airway narrows a lot, it can become an emergency. If you see even one of the following, don't delay — call emergency services or go to the ER.

• The breathing is noisy even when quietly at rest. If stridor that used to appear only when crying or moving now keeps sounding even during quiet rest, that's a sign the airway has narrowed a lot.
• Breathing is so hard that the chest, neck, or spaces between the ribs pull in. If the area below the neck or between the ribs sinks in with each breath, it means your baby is breathing with difficulty.
• The lips, face, or nails look blue. Bluish color (cyanosis) is an urgent sign that oxygen is low, so immediate emergency care is needed.
• They can't swallow saliva and drool, or have great difficulty swallowing. If this comes with a high fever and they look unusually unwell, it may be epiglottitis, inflammation of the epiglottis. Epiglottitis is a different emergency from croup and needs immediate care.
• They are limp and look unwell. If they are unusually floppy or slow to respond, don't put it off — get them seen.

Cyanosis, severe pulling-in, and stridor that continues even at rest are especially time-critical signs. Rather than hesitating with "let's watch just a bit longer," it's safer to ask for help right away when you see these.

What happens at the hospital?

At the ER or pediatrician's office, they first assess the situation by looking at how hard your baby is working to breathe and how much stridor there is. Croup tends to respond fairly well to treatment, so with appropriate care at the hospital, the swelling often goes down and your baby becomes noticeably more comfortable.

The most commonly used treatment is an oral steroid. To bring down the swelling of the narrowed larynx, a single dose of an oral steroid is generally known as the standard approach. Because it reduces the swelling itself, it helps ease the symptoms.

In more severe cases, nebulized epinephrine (adrenaline) may be used. This is a method of inhaling medication through a nebulizer to quickly calm the swollen airway, but because the timing of the effect and the course need to be watched, it's done under observation at the hospital. Which treatment is needed is for the medical team who examines your baby to decide, so rather than trying to prepare medication at home in advance, please focus on getting care.

Common misunderstandings about croup

Because something done with good intentions can end up putting a baby at risk, here are a few things to be especially careful about at night.

Be careful with the idea that "direct hot steam cures it." In the past, breathing in hot steam was sometimes suggested, but the evidence for its benefit is unclear, and there's a risk of burns from hot steam or water, so it isn't recommended. If you do want to give moist air, rather than breathing in hot steam directly, it's safer to fill the bathroom with steam and hold your baby inside it. Cool air can also help with calming, so don't push to insist on hot steam.

Don't give over-the-counter cough or cold medicine on your own just because the cough is bad. In particular, giving cough medicine or combination cold medicine to a baby under 2 years old based on a parent's own judgment is not recommended. The barking cough of croup is a sound made by the swollen airway, so forcibly suppressing the cough doesn't fundamentally make things better. Whether medicine is needed and which one is right should be confirmed with a pediatrician.

Antibiotics aren't always necessary. Because croup is usually caused by a virus, antibiotics used for bacterial infections often aren't generally needed. Whether it's a situation that needs antibiotics is decided by a doctor through examination. When runny-nose and cough symptoms overlap and it's confusing, you may also want to refer to information on telling apart a baby's runny nose and congestion during seasonal changes.

Frequently asked questions

How many days does croup last?

Mild croup usually gets better gradually over a few days. It often shows a pattern of being worse at night and easing during the day. Still, the course varies from baby to baby, and if the nighttime symptoms are severe or it doesn't improve after several days, it's a good idea to have your baby seen.

Is it contagious? When can they go back to daycare?

The viruses that cause croup can spread through coughing or contact. While symptoms are present, please keep up handwashing and cough etiquette to reduce spread. When to return depends on your baby's fever, condition, and how much they're coughing, so it's best to decide with your pediatrician's guidance along with the daycare's criteria.

Can a child who has had it get it again?

Yes, croup can happen again. Some children repeat a croup-type cough with every cold; in that case, having a pediatrician check things once can make it much easier to respond the next time.

They bark at night but are fine in the morning. Do we still need to see a doctor?

Being worse at night and easing during the day is the typical pattern of croup. Even if they look fine during the day, if the nighttime symptoms were severe or there was stridor or difficulty breathing, it's more reassuring to have them seen by a pediatrician during the day to check the situation.

In summary

• Recognizing it by sound: A barking cough, a hoarse voice, and stridor that wheezes on breathing in point toward croup. Getting suddenly worse at night is a characteristic feature.
• What to do tonight: First hold and calm your baby, let them breathe cool, moist air, and hold them upright while keeping them hydrated. Avoid breathing in hot steam directly, as there's a risk of burns.
• Emergency signs: Noisy breathing even at rest, chest or neck pulling in, blue lips, drooling with trouble swallowing, or severe floppiness — if you see even one, go to emergency services or the ER right away.

Croup has a scary name, but it usually gets better within a few days and tends to respond fairly well to treatment. Recognize it early by its sound, care for it at night with calming and moist air, and don't hesitate to ask for help when warning signs appear — just remember these three things.

When you're unsure whether it's another respiratory illness with wheezy breathing, take a look at how to tell RSV bronchiolitis from a cold. If you're wondering about managing indoor air and humidity, it also helps to check on how to set indoor air and humidity during seasonal changes.