In the US, 21% of children, more than 15 million children, live in poverty, far higher than other Organization for Economic Cooperation and Development countries. 1 A heartbreaking example of structural racism, Black, Hispanic, and Indigenous children are 3 times more likely to live in poverty than White children. 2 Like lead exposure, child poverty worsens physical, mental, and developmental health, along with education and social mobility, throughout one's life. 2,3 Therefore, reducing child poverty is a major public health goal, but how best to do so is unclear.Social policy, including cash child benefits, could improve health by reducing child poverty, but a policy's effects depend greatly on the details of its design. Medical and public health professionals may be reticent to wade into technocratic social policy minutiae, but if we care about the conditions that shape health, we have to care about the details of policies that shape those conditions. Here, we discuss these issues in the context of the largest US legislative effort to address child poverty in a generation: the American Rescue Plan Act expansion of the Child Tax Credit (CTC).