That also doesn't factor in the indirect benefits to the economy, like all the people who can't start a new business (etc.), being stuck in jobs they don't want because if they left they'd lose their benefits.
https://www.propublica.org/article/lost-mothers-maternal-hea...
Other possible factors could be a lack of prenatal care or (and this is separate) births outside of a hospital / medical setting.
"...very low-birth-weight infants who are at high risk of dying within the first day tend to be counted as live births. In countries where the health care system does not place the same emphasis on neonatal intensive care, the outcomes of such pregnancies are not likely to be recorded as live births. Hence, it appears that the more resources a country's health care system places on saving high-risk newborns, the more likely its registration will report a higher IMR" [0]