Heat exposure in pregnant people has been associated with negative and unexpected health outcomes in labor and delivery. One of these outcomes is low birth weight for babies which can be detrimental to their health. In New York, some boroughs experience higher temperatures due to the concentration of concrete, vehicle emissions, and lack of green space due to the consequences of environmental racism. These problems disproportionately affect low income communities of color, which creates a disparity in birth weight outcomes for this specific population of babies. For this poster I used heat vulnerability index (HVI) to analyze the effects of heat on low birth weight outcomes in zip codes within Bronx County, Kings County, New York County, and Queens County.