Research question: This project investigates the effects of family size and birth order on children's completed years of schooling. Method: An instrumental variables approach is used to identify the effect of family size. The effect of birth order is identified by examining the relation with years of education for different family sizes separately. Results: No significant effect of family size on educational attainment is found, while birth order has a significant negative effect. Information on financial transfers to children shows that earlier born children have a higher probability of receiving money from their parents than later born children, also the amount they receive is higher. These results indicate that the allocation of parental resources is a potential mechanism behind the birth order effects. Status: forthcoming in the Economics of Education Review.