I found this article by Irvine Loudon, apparently both an eminent historian of medicine and a trained and practicing clinician, on 'Maternal mortality in the past and its relevance to developing
countries today'. Rather interesting:
" Historical data show that maternal mortality rates were lowest for home deliveries undertaken by trained and supervised midwives with no exceptions. ...
In contrast with the above findings, maternal mortality rates were very high in countries, states, regions, or areas where most deliveries were performed by physicians, especially in the hospital.
Maternal mortality rates were also high when maximum surgical interference in normal or potentially normal labors was
encouraged or advocated.
Another unexpected finding related to maternal mortality, which was the basis for the second question raised at the beginning
of this paper, was the inverse relation between maternal mortality rates and social class. Here the evidence comes almost
entirely from Britain. Infant mortality is known to be strongly
related to social class; the highest rates are found among the
working classes, whereas the lowest rates are among the professionals.
From at least the 1830s, however, the risk of dying in
childbirth was higher in social classes I and II (the upper and
professional classes, respectively) than it was in social classes IV
and V (the skilled and unskilled laborers, respectively). An
example of this is shown in Table 2, which gives data for
1930?1932 (16). The only plausible explanation for this social
class difference is that the upper classes were more often delivered
by physicians and, therefore, more likely to suffer unnecessary
interference, whereas the lower classes were delivered by
midwives, almost all of whom were trained by 1930?1932."
He also concludes that, rather to his surprise, malnutrition was not a cause of maternal or neonatal mortality.
It's a very interesting article, with some slightly grim bits on 19th century 'advanced' practice that I didn't include here.