Pneumomediastinum is due to air penetration in to the mediastinum. In children it is mostly due to asthma, however in newborns pneumonia or meconium aspiration syndrome are the predisposing factors. Pneumomediastinum is recognised by chest radiography, in newborn babies - spinnaker sign- an upwards and outwards deviation of thymic lobes can be seen due to raising of thymus above the heart by pneumomediastinal air. Babies may be asymptomatic or they may have respiratory distress. Pneumomediastinum usually resorbs spontaneously over one or two weeks. Here we report two newborn babies with pneumomediastinum. Although pneumomediastinum was obvious in the chest X-rays, both babies had mild respiratory distress and mediastinal air resorbed spontaneously.