 1. Treatment study: Completion of the study at discharge possible re-admission according to protocol. Need for intensive care management or assisted ventilation continuous CPAP-Ventilator in which conventional management will be given. Treatment failure when the child is assessed severely ill and in need of open label treatment. These data will be recorded and analysed to see if there is a difference between the two treatment groups. We expect a small number of drop-outs, which should not make it necessary to expand the study above our goal of 500 patients. 