PT - JOURNAL ARTICLE AU - Ana Costa-Ramón AU - Mika Kortelainen AU - Ana Rodríguez-González AU - Lauri Sääksvuori TI - The Long-Run Effects of Cesarean Sections AID - 10.3368/jhr.58.2.0719-10334R1 DP - 2020 Oct 12 TA - Journal of Human Resources PG - 0719-10334R1 4099 - http://jhr.uwpress.org/content/early/2020/10/14/jhr.58.2.0719-10334R1.short 4100 - http://jhr.uwpress.org/content/early/2020/10/14/jhr.58.2.0719-10334R1.full AB - This paper analyzes the long-term effects of potentially avoidable cesarean sections on children’s health. Using Finnish administrative data, we document that physicians perform more unplanned C-sections during their regular working hours on days that precede a weekend or public holiday and use this exogenous variation as an instrument for C-sections. We supplement our instrumental variables results with a differences-in-differences estimation strategy that exploits variation in birth mode within sibling pairs and across families. Our results suggest that avoidable unplanned C-sections increase the risk of asthma, but do not affect other immune-mediated disorders previously associated with C-sections.