I know a lot of women died giving birth or shortly thereafter. But was their death due to blood loss? What would happen if they were unable to naturally give birth because of their petite size or the positioning of the fetus in the womb? Were c- sections common and what was the mortality rate of the child and mother after one?
Mortality data for this period is not readily available-- people simply didn't keep that kind of record, and diagnosis was not sufficiently advanced. But, generally in any "less than modern" time and place, the major causes of deaths of women associated with childbirth were infection and bleeding. This is well-documented for the 16th-18th centuries, and continues to be the case today. Prior to Semmelweis, who pioneered hand-washing, Many deaths were due to infection. Even in "third world" countries, today people seem to know more about the need for infection prevention, so bleeding has risen to a higher percentage of causes than it was at the time of Semmelweis.
An interesting article on this is found at: http://birthnerd.blogspot.com/2011/07/pre-modern-death-in-childbirth.html
There is an article on the web which addresses the issue for the 16th-18th centuries in the UK, which you might find interesting: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1139114/pdf/medhist00088-0087.pdf
I have no information on medieval C-sections, so cannot address that part of your question--- I would suspect they were quite rare, and frequently fatal, but that is simply a guess based on practice in other parts of the world.