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The Impacts of Temperature Shocks on Birth Weight in Vietnam

This paper investigates the extent to which in-utero exposure to temperature shocks affects birth weight outcomes in Vietnam. Exploiting the variations across districts and conception timing within districts, we show that a one standard deviation increase in temperature relative to the local norm (approximately 0.52 degree Celsius) during the first trimester of pregnancy reduces the child’s weight at birt h by 67 grams or 2.2%. Our heterogeneity analysis suggests that infants living in rural areas, born to poor and low-educated mothers are especially vulnerable to temperature shocks.