Here is the design of a clinical trial:

Official Title: Randomised Control Trial Comparing High Flow Weaning Strategies for Infants with Bronchiolitis: Pilot Study

Included conditions:
- Respiratory Disease
- Bronchiolitis, Viral
- Infant Morbidity

Study Armgroups:
- {'label': 'A: wean to 30%', 'type': 'ACTIVE_COMPARATOR', 'description': 'wean to 30% oxygen on high flow and then turn off high flow support and place onto standard low flow oxygen.', 'interventionNames': ['Device: High flow nasal cannula support']}
- {'label': 'B: wean to 21%', 'type': 'ACTIVE_COMPARATOR', 'description': 'wean to 21% oxygen on high flow and then turn off high flow support and place directly into air.', 'interventionNames': ['Device: High flow nasal cannula support']}

Interventions:
- {'type': 'DEVICE', 'name': 'High flow nasal cannula support', 'description': 'airvo2 highflow devices will be used.', 'armGroupLabels': ['A: wean to 30%', 'B: wean to 21%']}

Primary Outcomes:
- {'measure': 'Examine the feasibility of different weaning strategies for infants with bronchiolitis requiring HFNC.', 'description': 'we will assess the following objective in this feasibility trial:\n\n• identify the proportion of eligible patients approached who consent to the study; We will use a traffic light system to determine progress to a multi-centre RCT.', 'timeFrame': 'This will be during the recruitment time of the study (2 years)'}
- {'measure': 'Identify the proportion of recruited patients who supply secondary outcome data.', 'description': 'We will assess the following objective:\n\nidentify the proportion (percentage) of recruited patients who supply primary outcome data(time spent in hospital).', 'timeFrame': 'This will be during the recruitment time of the study (2 years)'}
- {'measure': 'Assess the adherence of the teams on the ward to the weaning protocol assigned during randomisation.', 'description': 'We will assess the following objective:\n\nto review the adherence to the weaning protocol assigned during randomisation, in particular if this can be complied with in a ward setting with a large number of healthcare staff. This will be measured as a yes or no response and calculated as a percentage/proportion.', 'timeFrame': 'This will be during the recruitment time of the study (2 years)'}
- {'measure': 'Assess the acceptability of HFNC and the weaning strategy by parents and healthcare staff.', 'description': 'We will assess the following objectives:\n\nto assess the acceptability of HFNC and the weaning strategy by parents and healthcare staff via questionnaires only.', 'timeFrame': 'This will be during the recruitment time of the study (2 years)'}

Please estimate the sample size based on the assumption: 
Not explicitly stated in the provided paragraph.
Sample size
          Local data at the Noahâs Ark Childrenâs Hospital for Wales had an average of 75 patients needing HFNC support on the ward over the last 2 years. We aim to 20 patients into the trial. This number should be sufficient in order to assess the primary feasibility criteria.