While many babies recover without serious problems, some may need medical attention. Knowing how the illness can change over time and what signs need attention can help you respond appropriately.
We spoke to Dr Bharat Jain, Senior Consultant – Pediatrics and Neonatology, Cocoon Hospital, Jaipur, to understand viral bronchiolitis in infants, its warning signs, and when parents should seek medical care.
What Is Viral Bronchiolitis in Infants?
Viral bronchiolitis is an infection that affects the small airways of your baby’s lungs. It causes these airways to become swollen and filled with mucus, which can make breathing more difficult. It commonly affects babies and children under two years of age.Causes of Viral Bronchiolitis in Babies
Common causes of viral bronchiolitis include:- RSV (Respiratory Syncytial Virus): The most common cause
- Rhinovirus: A virus that commonly causes colds
- Influenza: The virus that causes flu
- Adenovirus: Another virus that can cause respiratory infections
Symptoms of Viral Bronchiolitis in Infants
Common signs include:- Runny or blocked nose
- Cough
- Mild fever
- Fast or noisy breathing
- Wheezing
- Difficulty feeding
- Irritability or unusual tiredness
- Fewer wet diapers than usual
How Does Viral Bronchiolitis Progress in Babies?
Bronchiolitis usually starts with cold-like symptoms and may gradually worsen over the next few days. Breathing and feeding difficulties can increase as the infection progresses. Symptoms are often most noticeable around days 3–5, then gradually settle. Your baby may continue to have a cough for some time even after other symptoms improve.Viral Bronchiolitis vs Pneumonia: What Is the Difference?
The table below shows the key differences between viral bronchiolitis and pneumonia in babies:| Feature | Viral Bronchiolitis | Pneumonia |
| Main cause | Usually caused by viruses such as RSV | Can be caused by viruses or bacteria |
| Part affected | Small airways of the lungs | Air sacs (alveoli) of the lungs |
| Common symptoms | Cough, wheezing, runny nose, fast breathing | Cough, fever, fast or difficult breathing |
| Feeding | Babies may feed less because breathing is difficult | Poor feeding may occur, especially with severe infection |
| Treatment | Usually supportive care, fluids, and breathing support if needed | Depends on the cause; bacterial pneumonia may need antibiotics |
Which Babies Are at Higher Risk of Severe Bronchiolitis?
Certain babies may be more likely to develop severe symptoms and need closer monitoring.- Babies younger than 3 months
- Babies born prematurely
- Babies with heart or lung problems
- Babies with a weakened immune system
- Babies regularly exposed to cigarette smoke
Can Bronchiolitis Cause Complications?
Most babies recover without serious complications, but some may become more unwell, particularly when breathing or feeding is affected.Possible complications include:
- Poor feeding may lead to fewer wet diapers
- Severe breathing problems can reduce oxygen in the blood
- Some babies may need oxygen or hospital care
- Very young or premature babies may occasionally have pauses in breathing
“Infants of very young age may have mild symptoms. Infants can be abnormally drowsy, agitated, poor feeders or even suffer from breathing stops.”
How Is Viral Bronchiolitis Treated in Infants?
Dr Bharat Jain explains that treatment for viral bronchiolitis mainly depends on the baby’s symptoms and severity. Most infants recover with supportive care, while babies with significant breathing or feeding difficulties may require closer medical monitoring or hospital care.Treatment may include:
- Fluids: Help your baby stay hydrated
- Nasal care: Saline drops can help clear a blocked nose
- Oxygen: May be given when oxygen levels are low
- Hospital care: May be needed for severe breathing or feeding problems
- Medicines: Antibiotics are not used for viral bronchiolitis unless a bacterial infection is also present
How Can Viral Bronchiolitis Be Prevented in Infants?
Simple steps can help reduce your baby’s exposure to viruses:- Wash your hands before touching your baby
- Avoid close contact with people who are unwell
- Do not share cups, utensils, or towels
- Keep your baby away from cigarette smoke
- Clean frequently touched surfaces
When Should You See a Doctor for Bronchiolitis?
Seek medical advice if your baby experiences:- Breathing faster than usual
- Ribs pulling in while breathing
- Difficulty feeding or refusing feeds
- Fewer wet diapers than usual
- Unusual sleepiness or difficulty waking
- Pauses in breathing
- Blue or grey lips or skin
- Symptoms that are worsening instead of improving
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FAQs on Viral Bronchiolitis in Infants: Causes, Symptoms, Treatment and Prevention
- Can bronchiolitis make a baby’s breathing noisy?
Yes, mucus and swelling in the small airways can make breathing sound noisy. However, unusual or worsening breathing sounds should be discussed with your baby’s doctor. - Can bronchiolitis spread to other babies?
Yes, the viruses causing bronchiolitis can spread between people. Good hand hygiene and limiting close contact with sick people can help reduce the chance of transmission. - Can a baby have bronchiolitis with normal oxygen levels?
Yes. Many babies with mild bronchiolitis maintain normal oxygen levels. Your doctor may check oxygen saturation if your baby has breathing difficulties or appears unwell.