Rhinovirus is the most common cause of the common cold, and babies catch it frequently. In fact, rhinovirus is the leading cause of respiratory virus-related hospitalizations in children under 5, accounting for about 1.8% of all hospitalizations in that age group. Most of the time, rhinovirus causes a mild, self-limiting cold that clears up on its own. But in young infants, even a simple cold can interfere with feeding and sleep, which is why parents often end up searching for answers at 2 a.m.
How Babies Catch Rhinovirus
Rhinovirus spreads through tiny respiratory droplets when someone nearby coughs, sneezes, or talks. It also survives on surfaces like toys, doorknobs, and hands for hours. Babies are especially vulnerable because their immune systems are still developing and they constantly put their hands and objects in their mouths. Most children will catch several rhinovirus infections in their first year of life alone, with peak seasons in fall and spring.
What Rhinovirus Looks Like in Babies
The hallmark symptom is a runny nose. It typically starts with clear, watery discharge. After a few days, the mucus thickens and often turns brownish, gray, or greenish. That color change worries many parents, but it’s a normal part of the healing process, not a sign of a bacterial infection.
Beyond the runny nose, you may notice:
- Sneezing and mild cough
- Low-grade fever
- Decreased appetite, especially during breastfeeding or bottle feeding when nasal congestion makes it hard to suck and breathe at the same time
- Fussiness and disrupted sleep
Most rhinovirus colds last 7 to 10 days, with the worst congestion typically peaking around days 3 through 5. Some babies develop a lingering cough that can stick around for another week after other symptoms resolve.
How Rhinovirus Compares to RSV
Parents often hear about RSV and wonder how it differs from rhinovirus. The two can look nearly identical in the early stages. Both start with congestion and a runny nose. RSV tends to hit very young infants hardest, particularly those under 6 months, and is more likely to cause wheezing and require supplemental oxygen. In one study, 68% of hospitalized children with RSV needed oxygen support, compared to 47% of those hospitalized with rhinovirus.
That said, rhinovirus is not always mild. Research has found that children hospitalized with rhinovirus had higher rates of pneumonia (24.1%) compared to those hospitalized with RSV (9.7%). The children most at risk for severe rhinovirus illness tend to be slightly older (median age around 2 years for rhinovirus hospitalizations versus about 5 months for RSV) and often have an underlying condition like asthma or a history of wheezing. For otherwise healthy newborns, RSV generally poses the greater threat, but rhinovirus is far more common overall.
When Rhinovirus Needs Medical Attention
A baby under 2 months old with a rectal temperature above 100.4°F (38°C) needs emergency care immediately, even if the fever seems to be from “just a cold.” At that age, any fever can signal a serious infection. For babies between 2 and 3 months, the same temperature threshold of 100.4°F warrants an immediate call to their pediatrician. Older babies with a fever can generally be monitored at home unless other concerning signs develop.
Regardless of age, watch for signs that your baby is struggling to breathe. These include:
- Nasal flaring: the nostrils widen noticeably with each breath
- Chest retractions: the skin between the ribs, below the ribcage, or at the base of the throat pulls inward during breathing
- Grunting sounds at the end of each breath
- Wheezing or unusually noisy breathing
- Bluish tint around the lips, fingernails, or skin
A bluish color is a sign of severe breathing difficulty and requires immediate emergency care. Any of these other signs also warrant a prompt call to your pediatrician or a visit to urgent care.
Keeping Your Baby Comfortable at Home
Nasal Suctioning
Babies breathe primarily through their noses, so congestion hits them harder than it hits older children. A bulb syringe or nasal aspirator paired with saline drops is the most effective tool you have. Put a few saline drops in each nostril, wait a moment, then gently suction out the mucus. Do this before feedings, not after, because suctioning on a full stomach can cause vomiting. Limit suctioning to no more than four times a day to avoid irritating the delicate nasal lining.
Hydration
A congested baby often feeds poorly, so shorter, more frequent feedings can help. Whether you’re breastfeeding or formula feeding, the goal is to keep your baby well hydrated. Track wet diapers: fewer than six in a 24-hour period is a sign of dehydration in infants. Other dehydration signs include a dry mouth, fewer tears when crying, and unusual sleepiness.
Humidity and Positioning
A cool-mist humidifier in your baby’s room helps keep nasal passages moist and can ease congestion overnight. Running a hot shower and sitting in the steamy bathroom for a few minutes before bedtime works in a pinch. Keeping your baby slightly upright during awake time (like in a carrier or swing) can also help mucus drain more easily. Always follow safe sleep guidelines for actual sleep, placing your baby flat on their back in a crib.
Medications to Avoid
Over-the-counter cough and cold medicines should not be given to any child under 4 years old. Studies consistently show these products don’t work in young children, and they carry a risk of dangerous side effects. The FDA has also noted that phenylephrine, a common nasal decongestant ingredient in many OTC cold products, performs no better than a placebo.
If your baby has a fever and seems uncomfortable, acetaminophen is an option for babies 2 months and older (check with your pediatrician for dosing by weight). Be careful not to accidentally double up: many combination cold products already contain acetaminophen. Aspirin should never be given to children due to the risk of Reye syndrome, a rare but serious condition affecting the liver and brain. Honey, sometimes recommended as a cough remedy for older children, is unsafe for babies under 12 months because of the risk of botulism. Cough drops are a choking hazard for children under 4.
How Rhinovirus Is Diagnosed
Most of the time, your pediatrician will diagnose a rhinovirus cold based on symptoms alone. There’s no routine test ordered for a typical cold. In certain situations, particularly if a young infant is very sick or doctors suspect something more serious, a respiratory viral panel using PCR testing can identify rhinovirus. This involves a nasal swab and can return results relatively quickly. PCR testing is more commonly used in hospital settings to distinguish rhinovirus from other viruses like RSV, influenza, or enterovirus, especially in newborns where the clinical picture may not be straightforward.
There is no antiviral medication for rhinovirus and no vaccine to prevent it. Treatment is entirely supportive: manage symptoms, maintain hydration, and wait for the immune system to clear the virus. The silver lining is that each infection helps build your baby’s immune defenses, which is why colds gradually become less frequent and less disruptive as children get older.