We look at the effect of expanding secondary school access on teenage childbearing in Brazil. For this purpose we combine information from the Brazilian school census with vital statistics data. Variation in the introduction of schools across municipalities over time is used to estimate the effect of education access on teenage births. Our results show a 4.56% reduction in municipal teenage childbearing following a school introduction. These results suggest that Brazil’s secondary school expansion between 1997 and 2010 can account for 25% of a substantial decline in teenage childbearing observed over the same period.