AL those woman and more died during childbirth. But if you take them as a percentage of total female characters in GRRM's world, very less. Considering that all didn't die in the same age. Over years. Lots of diseases, war's, grief etc.  And not all those childbirth deaths are from childbirth. Like how Domeric Bolton didn't die from a stomach ache. Fir example, I have a personal crackpot that Joanna was finished off by Cersei to hide her relationship with Jaime or by Tywin after he found ou