A Child’s Cough: Croup, Bronchiolitis or Whooping Cough: How Parents Can Tell

Somewhere around 2 a.m., a parent sits on the edge of a toddler bed with a phone in one hand, recording. The sound is the reason: a cough that was an ordinary cold at dinner has turned into something that honks like a seal. By morning the recording will be played for a pediatrician, a grandparent and, almost certainly, a search engine.

That search is getting more crowded. As of early 2026, whooping cough has returned to levels not seen in more than a decade, with the CDC counting more than 35,000 reported US cases in 2024 compared with roughly 7,000 the year before, and 2025 running high as well. At the same time, two antibody products and a pregnancy vaccine have changed how babies can be protected against RSV, the leading cause of bronchiolitis. A kids cough has become a topic with real news attached to it.

So this guide does what the recording cannot: it explains what each cough sounds like, why, how the three illnesses move through a week, what actually helps, and which signs mean you stop watching and start driving.

What changed recently: whooping cough is back and RSV protection is new

Three dated developments explain the current spike in attention.

First, the numbers. The CDC’s pertussis surveillance reports show that whooping cough cases fell to unusually low levels during 2020 to 2022, when masking and distancing suppressed most respiratory infections, then climbed sharply. The 2024 total, above 35,000 reported cases, was the highest in more than ten years, and the agency has noted that case counts stayed elevated through 2025 with infant deaths reported in several states. Public health officials describe this as a return to the pre-pandemic pattern of peaks every three to five years, amplified by two quiet years in which immunity from infection and vaccination waned.

Second, bronchiolitis prevention moved from theory to shelf. In 2023 the FDA approved nirsevimab (Beyfortus), a long-acting monoclonal antibody, meaning a laboratory-made protein that supplies ready-made immunity for a season, for infants entering their first RSV season. The same year, the maternal RSV vaccine Abrysvo was approved for use late in pregnancy. In 2025 a second infant antibody, clesrovimab (Enflonsia), was approved and recommended by the CDC. For the first time, most US babies can reach their first winter with some protection against the virus behind roughly 60,000 to 80,000 pediatric hospitalizations each year.

Third, nothing changed about over-the-counter cough medicines, and that is the point. The FDA’s advice from 2008 still stands and still surprises parents: these products should not be used in children under 4, and many pediatric guidelines extend caution to age 6. The persistence of that guidance, alongside shelves full of child-branded syrups, is one reason the question keeps trending.

Each of these facts is tied to a reference listed at the end, and each shapes a section below.

Why a kids cough changes sound: three airways, three illnesses

A cough is a reflex: irritant sensors lining the airway fire a signal to the brainstem, the glottis slams shut, chest muscles build pressure, and the glottis releases. Air leaves at speeds that can exceed highway limits. What you hear depends on where along the airway the trouble sits.

Croup swells the tissue just below the vocal cords, a region called the subglottis, the narrowest part of a small child’s airway. Physics is unkind here. Airflow resistance rises with the fourth power of any drop in radius, so swelling of a single millimeter inside a trachea that is only about four millimeters across in a toddler can cut the open area by more than half. The result is a cough that resonates through a narrowed tube (the bark) and a harsh, high-pitched sound on breathing in called stridor.

Bronchiolitis lives far deeper, in the bronchioles, the smallest branching airways that end in the air sacs. Viral inflammation fills them with mucus and dead cells, so air squeaks past partial plugs: that is wheezing, mostly on breathing out. The cough is wet because there is genuinely something to move.

Whooping cough is different again. The bacterium Bordetella pertussis clings to the hair-like cilia that normally sweep mucus upward and releases toxins that paralyze them. Mucus pools, and the brainstem answers with a storm of coughs so rapid that the child cannot inhale between them. The desperate breath afterward, through a tightened throat, is the whoop.

Knowing the geography helps you interpret the recording. A bark says upper airway. A wheeze says lower. A relentless run of coughs with no breath in between says pertussis until proven otherwise.

Barking cough in kids: how to recognize croup

Croup is usually caused by parainfluenza viruses, though RSV, influenza and other common cold viruses can trigger it. It is most frequent between 6 months and 3 years, when the airway is smallest relative to the swelling an infection produces, and it peaks in fall and early winter.

The typical story runs like this. A child has one or two days of runny nose and low fever. Then, almost always at night, the cough changes character into a loud, brassy bark, the voice turns hoarse, and in moderate cases you hear stridor when the child cries or becomes upset. Symptoms are worst on the second and third nights and usually fade within three to five days, although a milder cough can trail on for a week.

Severity is judged less by the bark than by breathing at rest. Mild croup means a barking cough with no stridor when the child is calm. Moderate croup means stridor at rest plus visible effort: the skin pulling in between the ribs or above the collarbones, known as retractions. Severe croup means stridor at rest, marked retractions, agitation or unusual drowsiness, and pale or bluish color. The last group is an emergency.

What parents notice first, and worry about most, is how dramatically the sound shifts between calm and crying. That is expected, because crying speeds airflow through the narrowed segment. Keeping a child calm is therefore a real intervention, not just comfort.

One caution worth stating plainly: a child who is drooling, cannot swallow, sits leaning forward with the chin out and looks very unwell has a different pattern that needs emergency evaluation, even though it is now rare in vaccinated populations.

Bronchiolitis: the wet, wheezy cough of babyhood

Bronchiolitis is a diagnosis of the first two years of life, and most hospital admissions involve babies under 6 months. RSV (respiratory syncytial virus) causes the majority of cases; rhinovirus, human metapneumovirus and others fill in the rest. Nearly all children have met RSV by their second birthday, which is why the illness is so common in winter.

The timeline is remarkably consistent, and it is the single most useful thing a parent can know. Days one to two look like a cold: congestion, sneezing, perhaps a low fever. Days three to five are the hard part, as the infection reaches the small airways and the baby develops a wet cough, audible wheeze or crackling, and faster breathing. Feeding often suffers, because an infant who breathes through the nose cannot easily suck and breathe at once. From day five or six, most babies turn the corner, though the cough commonly lingers for two to three weeks.

Breathing rate is the vital sign to watch. The WHO thresholds for fast breathing are more than 60 breaths per minute in babies under 2 months, more than 50 at 2 to 12 months and more than 40 from 1 to 5 years. Count for a full minute with the baby settled; shortcuts mislead.

Hospital care, when needed, is supportive: oxygen if saturations are low, gentle nasal suction and help with feeding through a tube or intravenous fluids. Babies born prematurely, those under 3 months, and those with heart or lung conditions are at higher risk of needing this.

One subtle red flag deserves emphasis in very young infants: apnea, a pause in breathing lasting more than about 15 to 20 seconds, can be the first sign of RSV infection even before the cough appears.

Whooping cough in children: the cough that comes in fits

Pertussis, the medical name for whooping cough, is a bacterial infection with a long and deceptive timeline. The incubation period is typically 5 to 10 days and can stretch to three weeks. Then the illness unfolds in three stages.

The catarrhal stage lasts one to two weeks and looks like a mild cold: runny nose, occasional cough, little or no fever. This is also when the child is most contagious, which is why the disease spreads so efficiently through households and classrooms before anyone suspects it.

The paroxysmal stage follows. A paroxysm is a sudden fit of 5, 10 or more coughs in a single breath, often ending with a gasping inhale (the whoop), vomiting, or a face turning red or purple. Between fits the child may look surprisingly well. Fits cluster at night and can be set off by eating, laughing or crying. This stage runs one to six weeks and sometimes ten, which is why the infection is nicknamed the hundred-day cough.

The convalescent stage brings slow improvement over weeks to months, with fits recurring whenever another cold comes along.

Infants rewrite the script. Babies under 6 months frequently do not whoop at all. Instead they may stop breathing, turn blue, struggle to feed or simply seem exhausted. CDC data show that about a third of infants under one year who get pertussis are hospitalized, and most deaths occur in babies too young to have completed their own vaccinations. This is the group the whole prevention strategy is built to protect.

Diagnosis is confirmed with a nasal swab test, and pertussis is a reportable disease, so a positive result triggers public health follow-up and preventive antibiotics for close contacts.

Croup vs bronchiolitis vs whooping cough at a glance

Sound, age and tempo separate the three more reliably than any single symptom. The table collects the features parents can actually observe at home; it is a guide for conversation with a clinician, not a substitute for examination.

Feature	Croup	Bronchiolitis	Whooping cough
Usual cause	Parainfluenza and other viruses	RSV and other viruses	Bordetella pertussis bacteria
Typical age	6 months to 3 years	Under 2, mostly under 1	Any age; most dangerous under 6 months
Cough sound	Loud, seal-like bark; hoarse voice	Wet, rattly, with wheeze	Rapid fits, then a gasp or whoop
Breathing noise	Stridor on breathing in	Wheeze or crackles on breathing out	Normal between fits
Fever	Low to moderate	Low or none	Usually none or minimal
Worst point	Nights 2 to 3	Days 3 to 5	Weeks 2 to 4
Total course	3 to 7 days	2 to 3 weeks	6 to 10 weeks or longer
Vomiting after cough	Uncommon	Sometimes, from mucus	Characteristic
Key danger sign	Stridor at rest, retractions	Fast breathing, poor feeding, apnea	Apnea, blue spells, exhaustion
Preventable by vaccine	Partly (flu)	Yes, via maternal vaccine or infant antibody	Yes (DTaP, Tdap)

Two overlaps deserve mention. A child can have croup and bronchiolitis at once if the same virus inflames both the voice box and the small airways, and an older, partially immune child with pertussis may have only a persistent dry cough without fits. When the picture does not fit any column, that itself is a reason for an appointment.

What are the four types of cough, and does the sound settle it?

Parents often arrive at the clinic having read that there are four types of cough. The classification is informal, but it maps usefully onto what clinicians listen for.

A dry cough produces no mucus and usually reflects irritation of the upper airway or the lining of the trachea; it accompanies early colds, flu, allergies and asthma. A wet or productive cough moves mucus and is heard in bronchiolitis, later stages of a cold and chest infections. Children under about 6 generally swallow what they bring up, so a wet cough with no visible phlegm is still wet. A barking cough is croup until proven otherwise. A whooping or paroxysmal cough, meaning one that comes in uncontrollable fits, points to pertussis, although severe asthma and inhaled foreign bodies can mimic it.

Some lists add a fifth, the wheezing cough, which overlaps with wet and signals narrowing of the lower airways.

So does the sound settle the diagnosis? Partly. The bark of croup is specific enough that experienced clinicians diagnose it over the phone. The others are suggestive, not conclusive. Observational studies of parents’ and even doctors’ ability to label a cough by sound alone show only moderate agreement, which is why the examination adds listening with a stethoscope, counting breaths, checking oxygen saturation and sometimes a swab.

What the sound cannot tell you is severity. A quiet child with a soft cough who is breathing 55 times a minute is sicker than a loud barker breathing 30 times a minute. That is the single most important correction to the four-types framework: listen for the type, but watch the work of breathing.

What the evidence actually says about treating each cough

Grading the evidence matters, because the three illnesses respond to very different things and some popular measures rest on nothing but habit.

For croup, the strongest evidence in pediatric respiratory medicine supports a single dose of an oral corticosteroid, most often dexamethasone. A Cochrane review of more than 40 randomized trials found that it shortens symptoms, reduces return visits and lowers hospital admission. This is high-certainty evidence from randomized trials. For children with stridor at rest, inhaled epinephrine given in a medical setting improves symptoms within 30 minutes, also supported by randomized trials, though the effect wears off within about two hours and the child must be observed. Humidified or steamy air, by contrast, has been tested in several randomized trials and showed no measurable benefit. Cold night air has never been tested in a trial; the support is anecdotal and expert opinion.

For bronchiolitis, the evidence is mostly about what not to do. Randomized trials of bronchodilators such as albuterol, oral or inhaled steroids, antibiotics and chest physiotherapy have failed to show meaningful benefit, and guidelines in the US and UK now recommend against routine use. What helps is supportive care: oxygen when saturations fall, hydration and nasal suction. That rests on physiology and expert consensus rather than placebo-controlled trials, because withholding oxygen from a hypoxic infant would be unethical.

For whooping cough, antibiotics clear the bacteria and reduce spread, supported by observational data and small trials. Their effect on the cough itself is modest and depends on timing: started within the first one to two weeks they may shorten illness; after three weeks of coughing they rarely change symptoms, since the damage to cilia is already done. No cough suppressant has shown benefit for pertussis in trials.

Every treatment decision above belongs to the examining clinician, who weighs severity, age and history in a way no article can.

How do I get my kid to stop coughing? Comfort measures with evidence behind them

The honest answer is that you cannot switch off a cough that is doing its job, and you should not want to; it is clearing airways that need clearing. What you can do is reduce the irritation driving it and make the nights survivable.

Honey has the best evidence of any home measure. In randomized trials in children over 1 year, a spoonful before bed reduced cough frequency and improved sleep compared with no treatment, and performed at least as well as over-the-counter preparations. The effect is modest, measured in points on a parent-rated scale, but real. Never give honey to a baby under 12 months because of the risk of infant botulism.

Fluids keep mucus thin and replace what fast breathing and fever evaporate. Warm drinks for older children and smaller, more frequent feeds for babies are expert-consensus advice rather than trial-proven, but the physiology is sound.

Saline nose drops followed by gentle suction with a bulb or nasal aspirator help infants who cannot blow their noses, particularly before feeds and sleep. Evidence is observational, but the measure is low-risk and widely recommended.

A cool-mist humidifier in the bedroom has not shown benefit in trials for croup, yet many families find dry winter air worsens a tickly cough, and it does no harm if cleaned daily. Steam from a hot shower carries a scald risk and lacks trial support.

Keeping the air clear of smoke, including secondhand and thirdhand tobacco smoke on clothing, is strongly supported by observational data linking smoke exposure to more severe bronchiolitis and longer coughs.

Comfort itself counts. A calm, cuddled child with croup breathes more easily than a frightened one, and that difference is audible.

Why a child cough at night gets louder, and what helps before morning

Nearly every parent notices the same cruelty: a cough that was tolerable at noon turns relentless at bedtime. Several mechanisms converge after dark.

Lying flat lets mucus from the nose and sinuses drain backward onto the throat, where it triggers the cough reflex directly. Cortisol, the body’s own anti-inflammatory hormone, follows a daily rhythm and reaches its lowest point in the early hours, so airway swelling from croup and asthma peaks between roughly midnight and 4 a.m. Bedrooms are often drier and cooler than living spaces, and dust from bedding adds irritation for children with allergies. Finally, the house is quiet, so every cough is heard.

Position is the simplest lever. Older children can sleep with the head of the mattress raised slightly; babies must still be placed flat on their backs in a safe crib, since pillows and wedges increase the risk of sudden infant death. For an infant with heavy congestion, clearing the nose with saline and suction immediately before sleep buys the longest stretch of rest.

For croup specifically, the night-two and night-three pattern is so predictable that clinicians sometimes plan around it. A child seen in the daytime for a barking cough may be given a steroid precisely to blunt the coming night. If your child has been assessed and sent home with instructions, follow them; if the night brings stridor at rest or visible effort, that is the moment the instructions anticipated.

Honey at bedtime for children over 1 remains the best-supported nighttime measure, as covered above. A sip of water during a fit, a bedside light to keep panic down and a parent sitting close until breathing settles are not trial-tested, but they are what pediatric nurses do, and for good reason.

Cough and cold medicines for a kids cough: what labels and trials say

The pharmacy aisle sends one message and the evidence sends another, so it helps to separate the two.

Over-the-counter cough and cold products containing dextromethorphan, guaifenesin, antihistamines or decongestants carry labels stating they should not be used in children under 4. The FDA issued that advice in 2008 after reports of serious harm, including accidental overdose, and randomized trials in young children had failed to show these ingredients beat placebo. Many pediatric bodies advise avoiding them under 6, and the NHS says they are not recommended for under-6s and should be used in 6- to 12-year-olds only after advice from a pharmacist. For older children the trial evidence remains weak: small studies, short follow-up and effects that are hard to distinguish from the natural course of a cold.

Fever and pain relievers are a different category. Acetaminophen and ibuprofen do not treat the cough but can ease the aches and fever that make a sick child miserable; ibuprofen is labeled for infants over 6 months. Aspirin should never be given to children for a viral illness because of the risk of Reye’s syndrome, a rare but serious swelling of the liver and brain. Any dosing question goes to the pharmacist or prescriber, never to a search result.

Vapor rubs containing camphor and menthol have one notable randomized trial showing modest improvement in parent-rated night cough in children over 2, at the cost of some skin and eye irritation. Labels restrict them to 2 and up, and they must never be placed in or near the nostrils.

Antibiotics have no role in croup or bronchiolitis, which are viral. In whooping cough they are prescribed to stop spread and, if given early, to shorten illness. Whether to use them, and which one, is the clinician’s decision after testing.

Vaccines and RSV protection: who is eligible, in guideline language

Two of the three coughs in this article are substantially preventable, and the eligibility rules are specific.

For whooping cough, the CDC recommends the DTaP vaccine (diphtheria, tetanus and acellular pertussis) as a series beginning at 2 months of age and continuing through infancy and toddlerhood, with a final childhood booster between 4 and 6 years. Adolescents receive a Tdap booster at 11 to 12 years. Because protection fades over several years, teenagers and adults who have never had Tdap are advised to get it once, and the CDC recommends Tdap during every pregnancy, ideally between 27 and 36 weeks, so that antibodies cross the placenta and cover the baby through the gap before the infant’s own series takes effect. Observational studies from the US and UK indicate this reduces pertussis in babies under 2 months by around 75 to 90 percent.

For RSV, the CDC describes two routes and says most infants need only one. The maternal vaccine Abrysvo is recommended for pregnant people at 32 through 36 weeks of pregnancy during September through January in most of the US. Alternatively, an infant monoclonal antibody, nirsevimab or clesrovimab, is recommended for all babies under 8 months born during or entering their first RSV season whose mothers did not receive the vaccine or who were born less than two weeks after it. Nirsevimab is also recommended for children aged 8 through 19 months at increased risk entering a second season, including those born very prematurely or with chronic lung, heart or immune conditions.

Influenza vaccination is recommended yearly from 6 months and reduces one of the common triggers of croup.

The timing of any of these for a specific child, including catch-up after missed doses, is a conversation with the child’s pediatrician or the prenatal care provider.

Common myths about children's coughs, corrected

Viral posts and family lore circulate the same claims every winter. Here is what the evidence says about the most persistent ones.

Myth: cold night air treats croup. Many parents swear by a few minutes on the porch, and no trial has ever tested it. Cool air may shrink swollen tissue slightly, and the quiet dark calms a child, which eases breathing. There is no harm in trying it while you decide whether to seek care, but it is not a substitute for assessment when there is stridor at rest.

Myth: steam in the bathroom opens the airway. Randomized trials of humidified air in croup found no benefit over room air, and hot steam causes scalds. Skip it.

Myth: no whoop means it is not whooping cough. Infants, older vaccinated children and adults frequently have pertussis without a whoop. The clue is fits that leave the child breathless or vomiting, and a cough lasting more than two weeks.

Myth: vaccinated children cannot get whooping cough. They can, because protection wanes, but illness is typically milder and shorter and they are far less likely to be hospitalized. The current rise includes vaccinated children precisely because many are years past their last dose.

Myth: a wet cough means a chest infection that needs antibiotics. Most wet coughs in children are viral and clear within three weeks. Antibiotics do nothing for viruses and carry side effects.

Myth: children’s cough syrup is safe because it is sold for children. Labels prohibit use under 4, and trials show no benefit over placebo in young children.

Myth: a cough that lasts more than a week is dangerous. Post-viral cough commonly persists for two to three weeks. Duration alone is a reason for a routine visit at the three- to four-week mark, not for alarm.

When to see a doctor: when is a child's cough serious?

Most coughs need time, fluids and sleep. A minority need a clinician today, and a few need an ambulance now. The lines between them are clearer than the 2 a.m. panic suggests.

Call emergency services or go to the nearest emergency department immediately if a child:

• has blue, gray or very pale lips, tongue or face
• stops breathing, even briefly, or is struggling for every breath with the skin sucking in between the ribs, under the ribcage or at the base of the neck
• has stridor while calm and at rest, or is grunting with each breath
• is drooling, cannot swallow, or sits leaning forward unable to lie down
• is unusually drowsy, floppy, hard to wake or inconsolable
• may have inhaled a small object and is suddenly coughing or choking

Seek same-day medical advice if a baby under 3 months has any cough with a fever, if breathing is faster than the age thresholds listed earlier, if a baby is taking less than half of usual feeds or has had no wet diaper for eight hours, if coughing fits end in vomiting or a gasp, if a known household contact has pertussis, or if a child with asthma is using a reliever inhaler more often than prescribed.

Book a routine appointment if a cough lasts beyond three to four weeks, keeps coming back, is accompanied by weight loss or night sweats, or if a child coughs up blood or thick green mucus for more than a few days.

Bring the recording. Describe the timeline by day, because the day-three peak of bronchiolitis and the week-two fits of pertussis are diagnostic clues. And trust the instinct that brought you to the appointment: in studies of pediatric emergency visits, parental concern that a child is sicker than usual is itself one of the more reliable predictors of serious illness. Every decision about tests, medicines or admission then belongs to the clinician examining your child.

Frequently asked questions

How do I get my kid to stop coughing at night?

You cannot safely switch a cough off, but you can calm it. For children over 1, a spoonful of honey at bedtime reduced cough frequency in randomized trials. Clear a baby’s nose with saline and gentle suction before sleep, keep fluids going, avoid smoke exposure and raise the head of an older child’s mattress slightly. Babies must still sleep flat on their backs. If stridor or fast breathing appears, seek care rather than another remedy.

What should I do if my child has a cough?

Watch the breathing, not the noise. Count breaths for a full minute while the child is settled, check that lips stay pink, and make sure fluids and feeds continue. Most coughs are viral and clear within two to three weeks with rest and comfort measures. Skip over-the-counter cough medicines under age 4, never give honey under 1, and arrange a same-day visit if breathing is fast, feeding drops or coughing fits end in vomiting or a gasp.

How do I know if a child's cough is serious?

Serious signs are about effort and color rather than loudness: skin pulling in between the ribs, flaring nostrils, grunting, a harsh noise on breathing in while the child is calm, blue or gray lips, pauses in breathing, or unusual drowsiness. These need emergency care. Fast breathing, poor feeding, fewer wet diapers or any cough with fever in a baby under 3 months need same-day advice. A cough lasting past three to four weeks warrants a routine appointment.

What are the four types of cough in children?

The informal four are dry, wet, barking and whooping. A dry cough signals upper airway irritation from colds, allergies or asthma; a wet cough moves mucus, as in bronchiolitis or a chest infection; a barking cough is croup; and a whooping or paroxysmal cough comes in uncontrollable fits suggesting pertussis. Wheezing is sometimes listed as a fifth. The type hints at the cause, but how hard the child is breathing tells you how serious it is.

How long does a barking cough in kids last?

Croup usually runs three to five days, with the bark loudest on the second and third nights and improving each morning. A softer cough and hoarse voice can linger for about a week. If the bark persists beyond a week, returns repeatedly, or is accompanied by stridor while the child is calm and resting, a clinician should examine the airway, because other causes of upper airway narrowing can mimic croup.

Does whooping cough in children always come with a whoop?

No. The whoop is the gasp after a run of coughs and is most typical in preschool and school-age children. Babies under 6 months often have no whoop at all and may instead stop breathing, turn blue or struggle to feed. Vaccinated older children and adults may have only a persistent dry cough. Coughing fits that end in vomiting, or any cough lasting more than two weeks, should prompt testing, especially if a contact has pertussis.

Can a vaccinated child still get whooping cough?

Yes, because protection from the acellular pertussis vaccine fades over several years, which is one reason boosters are scheduled at 4 to 6 years and again at 11 to 12. Vaccinated children who do catch pertussis usually have a milder, shorter illness and are far less likely to need hospital care. The greatest danger is to infants who have not yet completed their series, which is why Tdap in pregnancy is recommended.

Why is my child's cough worse at night?

Lying flat lets mucus drain onto the back of the throat and trigger the cough reflex, bedroom air is often drier, and the body’s natural anti-inflammatory hormone cortisol reaches its lowest point in the early hours, so airway swelling from croup or asthma peaks between midnight and 4 a.m. The quiet house also makes every cough more audible. Positioning, nasal clearing before sleep and bedtime honey for children over 1 are the best-supported measures.

Can I give my toddler cough medicine?

Over-the-counter cough and cold medicines are labeled not for use in children under 4, following FDA advice from 2008, and many pediatric guidelines extend caution to age 6 because trials in young children showed no benefit over placebo and some risk of harm. Fever reducers such as acetaminophen, or ibuprofen over 6 months, may ease discomfort but do not treat the cough. Ask a pharmacist or your child’s clinician before giving any product.

Is cold night air good for croup?

It has never been tested in a randomized trial, so the evidence is anecdotal and expert opinion. Cool air may reduce airway swelling slightly, and the calm, dark setting often settles a frightened child, which itself eases breathing. It is reasonable to try for a few minutes while you assess your child, but stridor at rest, visible effort or bluish color mean the child needs medical evaluation, not more time outdoors.

References

• CDC: Pertussis Surveillance and Trends
• CDC: About Whooping Cough
• CDC: RSV Immunizations to Protect Infants
• NHS: Croup

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.