"Research has repeatedly shown that Black mothers and babies have the worst childbirth outcomes in the United States. But this study is novel because it’s the first of its size to show how the risks of childbirth vary by both race and parental income, and how Black families, regardless of their socioeconomic status, are disproportionately affected."

https://www.nytimes.com/interactive/2023/02/12/upshot/child-maternal-mortality-rich-poor.html