Julia Clifford Lathrop was an activist and social reformer in the late nineteenth to early twentieth centuries and the first chief of the United States Children’s Bureau. In that capacity, she conducted demographic studies to identify links between socioeconomic factors and infant mortality rates. Lathrop mobilized the effort to increase birth registration and designed programs and publications to promote infant and maternal health throughout the US. Through her studies, she empirically linked poverty and lack of education with higher than normal risks of infant and maternal mortality, and her results supported legislation aimed at lowering infant and maternal mortality in the US.