Acute bronchiolitis is a common viral infection that affects a large number of children each winter in western countries. 1 The most severe forms of bronchiolitis can lead to acute respiratory failure and therefore to admission in paediatric intensive care unit (PICU).Ventilatory support is commonly used in patients with bronchiolitis admitted in PICU, especially noninvasive ventilation. 2 Highflow nasal cannula (HFNC), continuous positive airway pressure (CPAP) and bilevel positive airway pressure ventilation (BiPAP) are increasingly used in patients with severe acute bronchiolitis. 3 In acute settings, noninvasive ventilation (including HFNC, CPAP and BiPAP) aimed to improve gas exchange, decrease work of breathing and improve patients' comfort. 4 Its benefits have been demonstrated in both physiological 5 and clinical 6 studies. However, the use of any type of noninvasive ventilation may also constitute a factor of discomfort, especially in acute settings. 7 An inappropriate interface 8 with an excessive tightening, 9 the presence of unintentional leaks, the presence of gastric dilatation 10 or the occurrence of asynchrony 11 may constitute significant sources of discomfort. 12