how long does bronchiolitis last

Bronchiolitis usually lasts for about 2 weeks, though most children see their symptoms peak between days 3 and 5 before starting to improve.¹²

Typical Timeline

• Days 1–2: Starts like a common cold with a runny nose, mild cough, and slight temperature.
• Days 3–5: Symptoms typically peak. A dry cough, fast or noisy breathing, wheezing, and feeding difficulties are most noticeable during this window.
• 1 to 2 Weeks: Most babies and young children steadily get better and recover within two weeks.
• Up to 3 Weeks (or longer): A residual cough or mild wheeze can occasionally linger for a few extra weeks as the airways heal.¹²³⁴

You can read more detailed guidance on what to expect and when to seek help through the NHS Bronchiolitis Guide or the Great Ormond Street Hospital Bronchiolitis Overview.¹²To help me give you more relevant information, could you share:

• How old the child is?
• How many days they have been unwell?
• What specific symptoms (like trouble feeding, high fever, or fast breathing) are worrying you right now?

Bronchiolitis typically lasts for about 2 weeks, though the timeline generally follows a predictable path:¹

• Days 1–3 (Early symptoms): Starts like a standard cold with a runny nose, mild cough, and sometimes a low-grade fever.
• Days 3–5 (Peak of illness): This is usually when symptoms are at their worst. The cough may become harsher and more frequent, breathing can get faster or noisier (wheezing), and some infants may temporarily feed less.¹
• Days 5–10 (Gradual improvement): The breathing effort eases, and feeding returns to normal.
• After 2 weeks (Resolution): Most children are completely recovered, though a dry, nagging cough can sometimes linger for a little while longer.¹

When to Seek Urgent Medical Attention

You should contact a GP, call 111, or seek emergency care immediately if your child shows any of these red-flag signs:

• Breathing difficulties: Breathing very fast, grunting, or you can see the skin pulling in tightly around their ribs (chest recession).
• Pauses in breathing: Brief gaps in their breathing pattern (especially in tiny babies).
• Poor feeding: Taking less than half of their usual amount over the last 2 to 3 feeds, or having no wet nappy for 12 hours or more.
• Extreme lethargy: Being unusually hard to wake up or crying continuously and inconsolably.
• Pale or blue tint: Bluish colour around the lips, tongue, or skin, or very cold/ashen hands and feet.¹

You can review official guidance and safety checklists on the NHS Bronchiolitis Overview Page.

Is this for an infant or toddler, and how many days into the illness are they right now? I can help you figure out what to watch out for.

Bronchiolitis usually lasts around 1–3 weeks, although the cough can sometimes linger for 3–4 weeks.

Typical timeline

• Days 1–3: Starts like a common cold, with a runny nose, sneezing and mild cough.
• Days 3–5: Symptoms often get worse, with more coughing, wheezing and potentially faster or harder breathing.
• Days 5–7: Usually the peak of symptoms, when breathing and feeding difficulties may be at their worst.
• Days 7–10: Most babies begin to improve.
• Weeks 2–3: Breathing and feeding generally return to normal, although coughing can continue.
• Weeks 3–4: Some babies still have an occasional cough.

When to seek medical help

(Emergency) Call 999 if your baby:

• Stops breathing or has pauses in breathing.
• Has blue or grey lips or tongue.
• Is struggling severely to breathe.

(Urgent medical advice) Contact NHS 111 or seek urgent medical assessment if:

• Breathing is faster or harder than normal.
• Feeding is significantly reduced.
• They have fewer wet nappies than usual.
• They seem unusually sleepy or difficult to wake.

Can I ask two things?

1. How old is your baby?
2. What day of bronchiolitis are they on?

I can help you understand whether they're likely approaching the worst of it or starting to recover.