Statistical analyses: All children registered during pregnancy will enter the study when they are visited at home or at 24 hours after birth whichever comes last, thereby excluding deaths on the day of birth. In the main analysis, survival of vaccinated children and unvaccinated children will be compared in Cox proportional hazards models with age as underlying time and censoring of follow-up on the date of the first visit by the BHP team when children in the control group will also be vaccinated.