The goal of this clinical trial is to learn if lavender essential oil chest wraps relieve cough in infants with bronchiolitis compared to standard care. Furthermore, the researchers will evaluate if breathing difficulties, nighttime awakening and impact on parents will be improved by the lavender oil chest wraps. Infants will be randomized to receive standard care with the addition of lavender oil chest wraps or to receive standard care alone. The study will take place in two locations in Switzerland, at the Geneva University Hospital and the Fribourg Cantonal Hospital.

Inclusion criteria:

• Bronchiolitis: clinical diagnosis based on the combination of respiratory distress (tachypnea, grunting, nasal flaring, retractions, and/or need for supplementary oxygen) and fine crackles sometimes accompanied by wheezing on auscultation.
• Hospitalization.
• Written informed consent.

Exclusion criteria:

• Patients with underlying diseases that impact respiratory or heart function (congenital heart disease, congenital malformation of the lung or airway system and severe chronic lung disease).
• More than 3 episodes of bronchiolitis.
• Critically ill infants who have an immediate need for intensive care unit (ICU) admission.
• Respiratory deterioration needing Continuous positive airway pressure (CPAP) or transfer to ICU during study enrollment.
• Atopic dermatitis, eczema or other skin lesions (particularly on the chest).
• Oncologic disease.
• Premature infants with mild bronchopulmonary dysplasia will not be excluded.

Deidentified individual data that supports the results will be shared beginning 9 to 36 months following publication provided the investigator who proposes to use the data has approval from an Institutional Review Board, Independent Ethics Committee, or Research Ethics Board, as applicable, and executes a data use/sharing agreement with the Geneva University Hospitals HUG.

Beginning 9 months and ending 36 months following article publication.

Investigator who has approval from an Institutional Review Board, Independent Ethics Committee, or Research Ethics Board, as applicable, and executes a data use/sharing agreement with the Geneva University Hospitals HUG.