People used to lose children so often in the not-so-distant past. My sense is that it was totally par for the course for a parent to lose at least one child, if not more. My contemporary experience of people losing children is that it is a life-shattering event, from which many parents never recover. How did parents deal with this grief in, say, 15th century Europe? Was it discussed? Idk why this is coming to mind, but Henry VII lost so many kids: what would that have been like - how would it have been considered by his peers? Would people have been like, wow Henry really has not been the same since it happened? In my history studies we never focused on the emotional element of this constant state of loss, the effect of which was that it seemed to me that historical figures were all terribly callous. I know that can't be true, and would love to hear if anyone has anything to say on the subject!
More can always be said, but this older answer might be of interest for you, courtesy /u/amandycat.