Follow-up: To assure proper identification of the children, the mother and newborn child will be driven home to document the location of the home. The children included in the study will be visited at 2, 6, and 12 months of age, to identify subsequent BCG vaccinations by inspection of the vaccination card, to weigh the child and measure arm-circumference, to assess BCG scarring and to document morbidity, hospitalisations and survival. Sick children identified during these visits will be referred for treatment at the relevant health institution. If the child has still not been vaccinated, the mother will be encouraged to bring the child for vaccination. Should the child have died, a verbal autopsy will be conducted. The children will be followed for morbidity, hospitalisations, and mortality up to 12 months of age. Within the study area they may be followed longer. In order to assure detection of possible complications to BCG vaccination, LBW children enrolled in the study will be provided with a card identifying the child, and the mother will be told to bring the child for consultation at the local Health Centre where consultations and treatment will be free of charge. The expected very rare complications will be treated according to WHO's recommendations.