Last updated: September 2026
Croup in toddlers is a viral infection that swells the airway just below the vocal cords, which is why your child sounds like a barking seal and why it always seems worse at 2 a.m. Most cases are mild and settle at home if you keep your child calm and upright, but a few signs mean you should go to the ER right away. Here is what to do tonight and what your pediatrician can do tomorrow.
Key takeaways
- Croup is caused by common viruses, most often parainfluenza, and hits hardest between 6 months and 3 years of age.
- Calm, upright, and hydrated is the evidence-based home plan. Cough syrup is not recommended under age 4.
- A single dose of an oral steroid from your pediatrician shortens the illness and lowers the chance of an ER visit.
- Go to the ER now for stridor at rest, ribs pulling in with each breath, blue or gray lips, or drooling with trouble swallowing.
What is croup and why does my toddler have it?
Croup is a viral inflammation of the voice box and windpipe. The swelling sits right below the vocal cords, in the narrowest part of a small child’s airway, so even slight swelling produces the hoarse voice, the barking cough, and the harsh noise on breathing in. Children are most likely to get it between 6 months and 3 years; older kids catch the same viruses but have wider airways, so they only get hoarse. [Source: AAP HealthyChildren.org, Croup and Your Young Child]
The usual culprit is human parainfluenza virus. Type 1 is the one most often tied to croup, and type 2 causes it as well. There is no vaccine and no antiviral for parainfluenza, so care is about supporting your child while the virus runs its course. [Source: CDC, Clinical Overview of Human Parainfluenza Viruses]
What does croup sound like?
It usually starts as an ordinary cold, then the cough changes to a seal bark and the voice turns hoarse. Fever is usually low, though a few children run up to 104°F. The sound to listen for is stridor: a high-pitched, raspy noise when your child breathes in. Wheezing, by contrast, is a whistle on breathing out from the lower airways. Mild croup produces stridor only when a child is crying. Stridor while calm and resting means the swelling is significant. [Source: AAP HealthyChildren.org, Croup: Treatment]
Why is croup worse at night and in the fall?
Lying flat lets secretions pool around the swollen area, the body’s natural steroid levels dip overnight, and a frightened child who wakes gasping cries harder, which tightens the airway. The AAP notes that croup is most common from October through March and often appears when children wake at night. [Source: AAP HealthyChildren.org, Croup and Your Young Child]
The CDC reports that parainfluenza types 1 and 2 both circulate most in the fall. In North Atlanta, barking coughs start once the weather turns in October and run through December, then blend into flu and RSV season. If your toddler in Marietta, East Cobb, Alpharetta, or Cumming develops a hoarse cold this fall, croup belongs near the top of your list. Our cold vs. flu guide covers the rest.
What can I do at home tonight for croup?
Stay calm and keep your child calm. This is the most useful thing you can do. Crying tightens the airway and makes the stridor louder. Hold your child, speak softly, put on a quiet show. [Source: AAP HealthyChildren.org, Croup: Treatment]
Keep them upright. Sitting on your lap is easier than lying flat. Never prop a baby under 12 months with pillows; hold them instead.
Try cool night air. Stepping outside on a cool fall night for a few minutes often settles a coughing fit. Studies have not proven it works, but it is harmless, it calms most children, and it lets you listen to the breathing.
A humidifier is fine, but the evidence is weak. No studies show steam or cool mist changes the course of croup. A cool-mist humidifier will not hurt; skip hot steam because of the burn risk.
Push fluids. Sore throats make kids drink less. Offer small sips often, and know the signs of dehydration in toddlers. For younger babies, count wet diapers.
Treat fever for comfort. Acetaminophen or ibuprofen (6 months and older), dosed by weight, is fine. A temperature of 100.4°F or higher in a baby under 3 months is a same-night call to the doctor regardless of the cough. [Source: AAP HealthyChildren.org, Fever Without Fear] Our fever guide covers dosing and warning signs.
What does not help croup?
Cough and cold medicine. Over-the-counter cough and cold products are not recommended for children under 4, and for ages 4 to 6 only if your doctor says so. They do nothing for airway swelling and may do harm. Honey can ease a nighttime cough in children 1 year and older, but never give it to babies under 12 months because of the risk of infant botulism. [Source: AAP HealthyChildren.org, Coughs and Colds: Medicines or Home Remedies?]
Home albuterol. Albuterol opens the small lower airways and does nothing for the upper-airway swelling of croup. Read when to use a nebulizer for a toddler and call us if you are unsure.
What will the pediatrician do for croup?
For anything beyond the mildest case, the standard treatment is a single dose of oral dexamethasone, a steroid that reduces airway swelling over several hours and keeps working for two to three days. Steroids decrease the intensity of croup symptoms and reduce the need for hospital care, and one dose is usually all a child needs. [Source: AAP HealthyChildren.org, Croup: Treatment]
For a child with stridor at rest or retractions, the ER may add nebulized epinephrine, which shrinks the swelling within minutes. Its effect wears off in a couple of hours, so children who receive it are watched for 3 to 4 hours for rebound.
Because croup is diagnosed by listening, a secure video visit is often enough for us to hear the cough and send the steroid to your pharmacy the same morning. If the picture is unclear, an in-office rapid test for flu, RSV, and COVID helps rule other viruses in or out.
When should I call the pediatrician, and when should I go to the ER?
Call us the same day if your child:
- Has a barking cough with stridor only when crying or active
- Is under 6 months old with any croupy cough
- Is not improving after 3 to 4 days
- Has a fever over 102°F for more than 2 days, or 100.4°F or higher under 3 months
- Is drinking noticeably less than usual
Go to the ER or call 911 now if your child:
- Has stridor while calm and resting, not just when crying
- Has retractions: the skin pulls in between or below the ribs, or at the base of the neck, with each breath
- Has blue, gray, or dusky lips, tongue, or fingernails
- Cannot speak, cry, or make sounds because they are short of breath
- Is drooling, cannot swallow, or sits hunched forward with the chin out to breathe. This can signal epiglottitis, a rare but dangerous infection of the flap above the vocal cords. Do not look in the throat or lay the child down; go now.
- Is breathing very fast, or seems exhausted, limp, or hard to wake
- Shows dehydration: no wet diaper in 8 hours, no tears, dry mouth
[Source: AAP HealthyChildren.org, Croup: Treatment]
If it is 2 a.m. and you cannot decide, trust the resting stridor rule. Our guide to pediatrician vs. urgent care covers where to go for everything short of that.
How long does croup last?
Croup typically runs 3 to 7 days. The bark and stridor are usually worst on the second and third nights, then fade, while a milder cough and hoarseness can linger another week. Keep your child home from daycare until the fever is gone and the cough has calmed. Repeated croup, croup after age 5, or croup that does not improve with steroids is worth a closer look at the airway.
Is it croup, whooping cough, RSV, or asthma?
Here is how the common fall and winter coughs usually differ. [Source: AAP HealthyChildren.org, Whooping Cough] [Source: AAP HealthyChildren.org, RSV: When It’s More Than Just a Cold]
| Feature | Croup | Whooping cough | RSV / bronchiolitis | Asthma |
|---|---|---|---|---|
| Cough sound | Barking, seal-like, hoarse | Rapid fits, then a “whoop” gasp; babies may pause breathing instead | Wet, rattly, heavy congestion | Dry, tight, often at night or with play |
| Breathing noise | Stridor on breathing in | Whoop after a fit | Wheezing and crackles on breathing out | Wheezing on breathing out |
| Fever | Low, occasionally up to 104°F | Usually none or low | Common | None unless a virus triggers it |
| Typical age | 6 months to 3 years | Any age; most dangerous under 1 | Under 2, worst under 1 | Often first noticed at 2 to 5 |
| Worst timing | Nights 2 and 3 | Weeks 2 to 6; can last months | Days 3 to 5 | With triggers: colds, pollen, cold air |
| Main treatment | Single-dose oral steroid | Antibiotics; prevented by DTaP | Supportive care, suction, fluids | Albuterol, controller inhalers |
If the cough is a whistle on the way out rather than a bark on the way in, read about childhood asthma symptoms and triggers. Whooping cough in a baby can be life threatening, so keep your child current on DTaP; see Georgia vaccination requirements for the schedule.
How Sun Pediatrics can help
Sun Pediatrics holds same-day sick visits every day at all four offices: Marietta at Windy Hill, East Cobb on Johnson Ferry Road, Alpharetta on Morris Road, and Cumming on Sanders Road. We are open Monday through Thursday 8:00 to 4:45, Friday 8:00 to 4:15, with a Saturday clinic from 9:00 to 12:00 on the first and third Saturday.
Every physician is board certified, and our team cares for children from birth through 18. We offer in-office rapid tests for flu, RSV, strep, and COVID, nebulizer treatments, and flu shots. New patients are welcome at every location.
Request an appointment online or call 678-501-5601. Same-day sick visits are held every day at all four offices.
Frequently asked questions
Is croup contagious?
The viruses behind croup spread through coughs, sneezes, and shared surfaces, so yes. Keep your child home while they have fever and wash hands often.
Can my toddler get croup more than once?
Yes. Several viruses cause croup, and some children react to every cold. Most kids outgrow it by age 5 or 6 as the airway widens.
Does croup need antibiotics?
No. Croup is viral, so antibiotics do not help. The medicine that does help is a single dose of an oral steroid from your pediatrician.
How is croup different from RSV?
Croup swells the upper airway and causes a bark and stridor on breathing in. RSV inflames the small lower airways and causes wheezing and heavy congestion, mostly in babies under 1. A rapid RSV test in our office can confirm which one you are dealing with.
This article is for general information and is not medical advice. Contact your pediatrician for care specific to your child.
