The 2000 French consensus conference for acute viral bronchiolitis management underlined the fundamental role of chest physiotherapy. According to Chalumeau and al., rib fractures were found out in 1/1000 children hospitalized for bronchiolitis or pneumonia. However, such complication of chest physiotherapy is exceptional. We report 2 cases with third to sixth lateral rib fractures after chest physiotherapy in infants with bronchiolitis. Despite the rarity of these complications, clinicians must keep in mind this etiology while facing rib fractures in infants.