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Risk factors
By Mayo Clinic staffOne of the greatest risk factors for getting bronchiolitis is being younger than 6 months old, because the lungs and immune system aren't yet fully developed. Boys tend to get bronchiolitis more frequently than girls do. Other factors that have been associated with an increased risk of bronchiolitis in children include:
- Never having been breast-fed — breast-fed babies receive immune benefits from the mother
- Premature birth
- An underlying heart-lung condition
- A depressed immune system
- Exposure to tobacco smoke
- Contact with multiple children, such as in a child care setting
- Having siblings who attend school or child care and bring home the infection
