Background: Acute bronchiolitis is an acute viral lower respiratory tract infection of infants and is the leading cause of hospitalization of infants below 2 years of age. Being a viral disease, there is no effective treatment of this problem other than supportive care. To provide this care, both 0.9% normal saline with salbutamol and 3% hypertonic saline has been found effective. This study was undertaken to assess the efficacy of 7% hypertonic saline on recovery from acute bronchiolitis.