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There is increasing evidence that early childhood health interventions have long-term effects on cognitive development, educational achievement and adult productivity. We examine the effect of measles vaccination on the school enrolment of children in Matlab, Bangladesh. An intensive measles vaccination programme was introduced in one area in 1982, and extended to another in 1985, while a third area acted as a control. Using this staggered roll-out as an instrument, we find that age-appropriate vaccination raises the probability that a boy has enrolled in school by 7.4 percentage points but appears to have no effect on girls' enrolment.