I agree there are lots of reasons to be discussed, but it's my understanding that access to postpartum healthcare is certainly one of the factors, one that varies widely by insurance company. Medicaid, for example, only covers two months of care for mothers after they give birth,[1] and even then care compares poorly to other countries with more equitable healthcare systems.

[1] https://www.npr.org/2017/05/12/527806002/focus-on-infants-du...