No_intervention: Standard Protocol Group

Control Arm (Pre-Protocol Implementation):~This group includes patients aged 1-24 months receiving HFNC (High-Flow Nasal Cannula) therapy for bronchiolitis based on the conventional, non-standardized approach. HFNC weaning decisions in this group are made at the treating clinicians' discretion, without following a formal protocol. Decisions are influenced by clinical presentation, respiratory effort, and clinician experience. This group serves as the control arm, representing the current standard of care.

Active_comparator: New Protocol Group

This group includes patients aged 1-24 months who are randomized to receive HFNC therapy under a newly implemented standardized weaning protocol, developed using Quality Improvement (QI) methodology. The protocol involves a structured, criteria-based weaning approach with clear steps for reducing HFNC support, focusing on clinical indicators like respiratory rate, work of breathing, and oxygen saturation. A multidisciplinary team, including pediatricians, nurses, and respiratory therapists, created this protocol, and staff received training before implementation.