Croup at night: what to do when the bark starts

You're going to recognize croup the first time you hear it. The cough sounds like a seal barking. Not a regular wet cough. Not a dry one. A barking, honking, sometimes squeaking sound that comes out of your kid's chest at 11 PM and pulls you out of bed.

What croup actually is

Croup is a viral infection that swells the upper airway, mostly the voice box (larynx) and the windpipe (trachea) just below it. The narrowed airway makes the bark cough and, in worse cases, a high-pitched whistle when your child breathes in. That whistle is called stridor.

Most cases are caused by parainfluenza viruses, but RSV, flu, COVID, and a handful of other respiratory viruses cause croup too. The peak ages are 6 months to 3 years. Kids can still get croup up to age 6. Older kids tend to get milder cases because their airways are bigger.

Croup almost always shows up between 10 PM and 2 AM. The reason is biology, not bad luck. Airway swelling is worse when your child has been lying flat, and the lungs naturally produce less anti-inflammatory cortisol overnight. It will usually be a little better by morning. Then it comes back the next night.

How to know it's croup and not something else

The seal-bark cough is the single most reliable sign. If you've never heard one, search "croup cough" on YouTube right now while your kid is still calm. Knowing the sound makes the next 3 nights less scary.

Other signs:

• Hoarse, raspy voice or cry.
• A low-grade fever (usually 100 to 102 F).
• Cold symptoms (runny nose, congestion) that started a day or two before the cough.
• Symptoms worse at night, better during the day.
• Worse when your child is upset or crying.

Things that are NOT croup:

• Wheezing (whistling when breathing OUT) suggests asthma or bronchiolitis, not croup. Croup makes noise on the breath IN.
• Sudden cough with no cold beforehand, especially in a kid old enough to be eating finger foods, can be a choking event. Read our toddler choking response guide if you suspect that.
• Drooling, refusal to swallow, and a fever above 103 F with no cough can be epiglottitis. That's an emergency. Skip the home steps and go to the ER.

The steam-and-cool-air trick

This is the home treatment that actually works and that pediatricians recommend. It's a one-two punch.

Step 1: 10 minutes of steam. Take your child into the bathroom. Close the door. Turn the shower on as hot as it will go, but don't put your child near the water. Sit on the floor or on the closed toilet lid with your child on your lap. Read a book. Sing a song. The point is to keep them calm. Crying makes the airway swelling worse.

Step 2: 10 minutes of cool night air. After the steam, bundle your child in a blanket and step outside, or open a freezer, or stand in front of an open window in winter. The cool air shrinks the swelling. In summer, opening the freezer counts.

Most kids will calm down and breathe easier within 20 minutes of this sequence. The cough will still be there. The struggle to breathe should ease.

Other things that help:

• A cool-mist humidifier in the bedroom for the rest of the night.
• An upright position. Hold your child upright on your chest or prop the head of the crib mattress up a few inches (never use a pillow in a crib).
• Fluids. Cool fluids feel good on a sore throat. Popsicles count.
• Acetaminophen or ibuprofen for fever if your child is uncomfortable. Check our Tylenol dose calculator for the right amount.

When to call your pediatrician within 24 hours

Most croup cases never need a doctor visit. But call within a day if any of these apply:

• Your child is under 6 months old.
• This is the first time you've heard the bark.
• Stridor (the whistle on breath in) only when crying, not at rest.
• Fever above 102 F for more than 24 hours.
• Symptoms aren't improving by day 4.
• Your child has had croup more than 3 times in a year (some kids get a steroid as a standby).

For mild-to-moderate croup that's not improving overnight, doctors usually prescribe a single dose of an oral steroid called dexamethasone. It works within 6 hours and lasts 3 days, which usually carries kids through the worst of the illness. If your pediatrician wants you in the office, the visit is worth it.

When to go to the ER tonight

Don't wait until morning if any of these are true:

• Stridor at rest. The high-pitched whistle on breath in, even when your child is calm and sitting quietly.
• Chest pulling in. The skin sucks in between the ribs or above the collarbone when your child breathes. This is called retractions and means they're working hard to move air.
• Blue or gray lips, tongue, or fingernails. That's a low-oxygen sign. Call 911.
• Can't speak in full sentences. Or for younger kids, can't cry loudly.
• Drooling or can't swallow. This points to a swollen epiglottis, not regular croup. ER now.
• Extreme agitation or extreme drowsiness. Both can mean oxygen is low.

At the ER, the standard treatment is the same dexamethasone dose, often paired with nebulized epinephrine for the swelling. Most kids are observed for 3 to 4 hours and discharged home. Admission is uncommon.

The next 3 nights

Croup usually peaks on night 2 or 3 and improves from there. The pattern looks like:

• Night 1: Cold symptoms with a hint of bark at bedtime. Cough flares overnight.
• Night 2: Worst night. Most ER visits happen tonight. The steam-and-cool-air sequence is what gets you through.
• Night 3: Still barking but less stridor.
• Night 4 to 5: Sounding more like a regular cough. Cold symptoms still lingering.
• Day 7 to 10: Most cough resolved. Voice still a little hoarse.

Sleep in the same room. Have a humidifier on. Keep a thermometer on the nightstand. Have your child's weight written down so you can dose meds without doing mental math at 2 AM.

What does not help

• Cough suppressants. Not recommended in kids under 6 anyway, and they don't shrink the swelling that's causing the cough.
• Antibiotics. Croup is viral. Antibiotics will do nothing.
• Lying flat. Makes it worse. Keep your child upright.
• Hot tea, hot water bottles, or hot compresses. Heat puffs up swollen tissue more. Cool air is what shrinks it.

Preventing the next round

You can't really prevent croup. It's caused by the same viruses that cause every other winter respiratory illness. Hand washing, flu shots, and keeping sick kids out of daycare help reduce exposure. Once your child has had croup, they're likely to get it again. Some kids get a milder version every cold for 2 or 3 winters.

If your child is a chronic croup kid, ask your pediatrician about keeping a single dose of dexamethasone at home for the next episode. Many will prescribe it as a standby for families who know the pattern.