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Is child mortality relevant to your story? If not, then I just wouldn't bring it up. There are all sorts of tragedies in the world. I don't consider a story unrealistic because it failed to discuss...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/42043 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Is child mortality relevant to your story? If not, then I just wouldn't bring it up. There are all sorts of tragedies in the world. I don't consider a story unrealistic because it failed to discuss every possible thing that could go wrong with anyone's life. In the 21st century, people die from cancer, but most novels never mention cancer. People lose their jobs, but most novels don't discuss unemployment. People are robbed and murdered and kidnapped, but most novels don't mention these events. Etc. Frankly, I would be very surprised if, say, a murder mystery said, "Detective Brown arrived at the scene of the crime. Brown had two children, a boy and a girl, plus a second daughter who had died of leukemia many years before. Brown and his wife were very upset when their daughter died. Mrs Brown cried uncontrollably for days ..." etc, and then have all of this never be relevant to the murder or to anything else in the story. In general, we don't expect a story to describe everything that ever happened or might have happened in every character's life. We expect a story to have a point and a focus. I am suddenly reminded of a piece of writing advice I read many years ago: Don't tell everything that happened. Tell everything RELEVANT that happened. You could, of course, write a good story about the grief parents suffer when a child dies. Or about the effect on society of high child mortality. But if that's not what the story is about, don't drag it in just because it exists.