 Treatment: Nebulised racemic adrenaline vs saline throughout the hospital stay. Inhalations given on demand parentsnurse vs fixed x 4--12. Open saline inhalations may be given at any time, other inhalations is not allowed. Neither is systemic corticosteroids which is not a proper treatment for acute bronchiolitis, according to Norwegian guidelines. All other treatment will be given according to usual local practice. 