“…Our study contributes to a burgeoning literature, which has identified adverse shortterm impacts of extreme temperature on several outcomes, including elderly mortality (Deschênes and Moretti 2009;Deschênes and Greenstone 2011), population-level emergency department visits and hospitalizations (Green et al 2010;White 2017), and cognitive performance (Cho 2017;Garg, Jagnani, and Taraz 2018;Goodman et al 2018;Graff Zivin, Hsiang, and Neidell 2018). Multiple studies have further documented negative effects of in utero heat exposure on birth outcomes-including birth weight, gestation length, and the probability of stillbirth (e.g., Deschênes, Greenstone, and Guryan 2009;Dadvand, Basagana, and Sartini 2011;Schifano et al 2016;Auger et al 2017;Ha, Liu, Zhu, Kim, Sherman, Grantz, and Mendola 2017;Kuehn and McCormick 2017;Barreca and Schaller 2020;Bekkar et al 2020)-highlighting the sensitivity of the prenatal period to extreme heat.…”