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Romashka comments on Open Thread, Apr. 20 - Apr. 26, 2015 - Less Wrong Discussion
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You really can't have a kid survive its mother who died in childbirth if the kid is as helpless as here.
UNLESS you have not only competition, but altruism, too.
Yes, altruism can pretty easily be part of the picture. Kin selection and all that. Or, we can simply say that if a gene makes a male mate with 2x as many females but also makes 20% of the females die with the child dying too, it still propagates. And it still increases sexual competition by unbalancing gender ratios thus if it was in itself a sexual competition advantage, now it is on the relative level stronger.
Propagates for a very short while. If you initial population was stable (which means that each female had, on the average, two children which survive until they breed), introducing a mutation which kills off 20% of the females during birth is likely to lead to this population dying out pretty quickly. Yes, you'll have lots of males around, but they can't give birth.