Baby Wheezing
Medically reviewed by Dr. Michael Okonkwo, MD, FAAP · Board-Certified Neonatologist
Content reviewed against published AAP, AAP, CDC guidelines
Last reviewed:
If your baby has been diagnosed with or you suspect baby wheezing, here is what the evidence says.
The short answer
Wheezing is a high-pitched whistling sound heard during breathing out, caused by narrowed airways. In babies, the most common cause is a viral infection like bronchiolitis (often RSV). Many babies wheeze once or twice during their first viral illnesses and never wheeze again. However, wheezing with breathing difficulty always warrants medical evaluation.
Key takeaways
- Wheezing is a high-pitched whistling sound heard during breathing out, caused by narrowed airways. In babies, the most common cause is a viral infection like bronchiolitis (often RSV). Many babies wheeze once or twice during their first viral illnesses and never wheeze again. However, wheezing with breathing difficulty always warrants medical evaluation.
- Usually normal when: Brief, mild wheezing during a cold that does not affect your baby's breathing comfort, feeding, or activity level
- Call your doctor if: Your baby is working hard to breathe: fast breathing, ribs showing with each breath (retractions), nostrils flaring, or belly moving in and out forcefully
- Varies by age — see the age-by-age breakdown below
“If your child is breathing very fast, has blue lips or fingernails, or is working hard to breathe — with the skin pulling in around the ribs or neck — seek emergency care immediately.”
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What Parents Should Know
According to AAP, CDC guidelines, wheezing is a high-pitched whistling sound heard during breathing out, caused by narrowed airways. In babies, the most common cause is a viral infection like bronchiolitis (often RSV). Many babies wheeze once or twice during their first viral illnesses and never wheeze again. However, wheezing with breathing difficulty always warrants medical evaluation. At 0-6 months, young babies have very small airways, so even mild swelling from a viral infection can cause noticeable wheezing. Bronchiolitis caused by RSV (respiratory syncytial virus) is the most common cause in this age group. Babies under 3 months with wheezing need prompt medical evaluation because their small airways are particularly vulnerable. Upper airway noises from nasal congestion can sometimes be mistaken for wheezing; true wheezing is heard during exhalation. It is generally considered normal when brief, mild wheezing during a cold that does not affect your baby's breathing comfort, feeding, or activity level. However, you should contact your pediatrician promptly if your baby is working hard to breathe: fast breathing, ribs showing with each breath (retractions), nostrils flaring, or belly moving in and out forcefully.
Normal vs. Concerning
When to Seek Immediate Care
- Your baby is working hard to breathe: fast breathing, ribs showing with each breath (retractions), nostrils flaring, or belly moving in and out forcefully
- Your baby's lips or fingernails have a bluish tint, which indicates low oxygen and requires emergency care
- Your baby is wheezing and refusing to drink fluids, seems lethargic, or is significantly less active than usual
By Age
What to expect by age
0-6 months
Young babies have very small airways, so even mild swelling from a viral infection can cause noticeable wheezing. Bronchiolitis caused by RSV (respiratory syncytial virus) is the most common cause in this age group. Babies under 3 months with wheezing need prompt medical evaluation because their small airways are particularly vulnerable. Upper airway noises from nasal congestion can sometimes be mistaken for wheezing; true wheezing is heard during exhalation.
6-12 months
Viral-induced wheezing remains the most common cause. Many babies in this age group will wheeze with their first significant cold, particularly during RSV season (fall and winter). The wheezing typically peaks around day 3-5 of illness and then gradually improves. Your doctor may recommend saline drops and suctioning, keeping your baby hydrated, and monitoring breathing effort.
12-24 months
Some toddlers develop recurrent wheezing with viral infections. Having 3 or more wheezing episodes is sometimes called "recurrent wheezing" and may be an early sign of asthma, particularly if there is a family history of asthma or allergies, or if the child has eczema. Your doctor may prescribe a bronchodilator (albuterol) to use during wheezing episodes.
2-3 years
By this age, a pattern of recurrent wheezing can be more clearly evaluated. Many children who wheezed as infants stop wheezing by age 3-5 and do not develop asthma. Children with persistent recurrent wheezing, especially between illnesses, may be started on daily preventive medication. Your doctor can help distinguish transient viral wheezing from early asthma.
What to Tell Your Pediatrician
- Describe when you first noticed baby wheezing and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if your baby has wheezing with every cold, or has had 3 or more wheezing episodes.
- Mention if your baby wheezes even when they do not have a cold.
- Bring a list of any questions or observations you want to discuss at the appointment.
What Should You Do?
When to take action
- Brief, mild wheezing during a cold that does not affect your baby's breathing comfort, feeding, or activity level
- Noisy breathing from nasal congestion that improves with saline and suctioning (this is usually not true wheezing)
- A single wheezing episode during a viral illness that resolves as the cold improves
- Your baby is breathing comfortably, feeding well, and has normal color despite some audible wheeze
- Your baby has wheezing with every cold, or has had 3 or more wheezing episodes
- Your baby wheezes even when they do not have a cold
- There is a family history of asthma and your baby is wheezing recurrently
- You are unsure whether the sounds your baby makes are wheezing or just normal congestion noises
- Your baby is working hard to breathe: fast breathing, ribs showing with each breath (retractions), nostrils flaring, or belly moving in and out forcefully
- Your baby's lips or fingernails have a bluish tint, which indicates low oxygen and requires emergency care
- Your baby is wheezing and refusing to drink fluids, seems lethargic, or is significantly less active than usual
What You Can Do at Home
- Keep track of when you notice baby wheezing — noting the time of day, duration, and any triggers can help your pediatrician.
- Remember that brief, mild wheezing during a cold that does not affect your baby's breathing comfort, feeding, or activity level — this is generally within the range of normal.
- At 0-6 months, focus on observation rather than intervention unless your pediatrician advises otherwise.
- Follow any care instructions from your pediatrician. Keep a written log of symptoms to bring to appointments.
- While monitoring at home, seek immediate care if your baby is working hard to breathe: fast breathing, ribs showing with each breath (retractions), nostrils flaring, or belly moving in and out forcefully.
Related Resources
Breathing Difficulty Triage
Assess breathing concerns and know when to seek emergency care.
Month-by-Month Development
Detailed monthly development guides from birth through 24 months.
When to Call the Doctor
General guide on when to call the pediatrician, visit urgent care, or go to the ER.
Frequently asked questions
Is baby wheezing normal?
When should I call the doctor about baby wheezing?
When is baby wheezing normal?
What causes baby wheezing?
What should I mention to my pediatrician about baby wheezing?
Is baby wheezing normal at 0-6 months?
Is baby wheezing normal at 6-12 months?
Should I go to the ER for baby wheezing?
Does baby wheezing go away on its own?
References
Doctor Visit Checklist
Bring this checklist to your next pediatrician visit to discuss Baby Wheezing.
Things to mention
- Describe when you first noticed baby wheezing and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if your baby has wheezing with every cold, or has had 3 or more wheezing episodes.
- Mention if your baby wheezes even when they do not have a cold.
- Bring a list of any questions or observations you want to discuss at the appointment.
Observations to share
- Your baby has wheezing with every cold, or has had 3 or more wheezing episodes
- Your baby wheezes even when they do not have a cold
- There is a family history of asthma and your baby is wheezing recurrently
Urgent signs to report immediately
- Your baby is working hard to breathe: fast breathing, ribs showing with each breath (retractions), nostrils flaring, or belly moving in and out forcefully
- Your baby's lips or fingernails have a bluish tint, which indicates low oxygen and requires emergency care
- Your baby is wheezing and refusing to drink fluids, seems lethargic, or is significantly less active than usual
My notes
From ismybabyalright.com — free, evidence-based baby health guides
All content follows our editorial policy and is reviewed against published clinical guidelines.
2,705 evidence-based guides6 authoritative medical sources5 medical advisory board members
Related Resources
Bottom line
Most cases of baby wheezing are normal. Talk to your pediatrician if your baby is working hard to breathe: fast breathing, ribs showing with each breath (retractions), nostrils flaring, or belly moving in and out forcefully.
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.
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