Introduction. Bronchiolitis is the leading cause of Pediatric Intensive Care Unit (PICU) admission for lower respiratory tract infection in infants. Although survival has improved, concerns remain regarding potential long-term functional impairments, including alterations in psychomotor development, learning, and behavior. This study aimed to describe the epidemiological and clinical characteristics of children admitted to the PICU for bronchiolitis and to evaluate their functional outcomes at 12-month follow-up. Methods. A retrospective descriptive cohort study was conducted, including all patients admitted to the PICU for bronchiolitis during the 2021–2022 period. Epidemiological, clinical, microbiological, and laboratory data were collected. Functional health status was assessed using the Pediatric Overall Performance Category (POPC), Pediatric Cerebral Performance Category (PCPC), and Functional Status Scale (FSS) at PICU discharge and 12 months. Changes in functional status were categorized as improved, stable, or worsened. Exploratory unadjusted analyses were performed to describe differences between outcome groups. Results. A total of 164 patients were included (43.9% female), with a median age of 51 days (IQR 26.25–118.5). Respiratory syncytial virus was identified in 79.7% of cases. Invasive mechanical ventilation was required in 31.1% of patients, and 45.7% developed complications during PICU admission. Mortality was 0.6%. At 12 months, functional deterioration was observed in 14.6% of patients according to POPC, 16.5% according to PCPC, and 3.6% according to FSS. Higher proportions of functional deterioration were observed among patients with underlying medical conditions, those requiring invasive mechanical ventilation, those with complications, and those with longer PICU and hospital stays, particularly in the PCPC scale. Conclusions. Most children admitted to the PICU for bronchiolitis showed stable or improved functional status at 12 months. However, a subset experienced functional deterioration, more frequently observed in patients with greater clinical severity and complexity during admission. These results support the need for further studies to better characterize long-term outcomes and to identify children who may benefit from closer follow-up.