I just recovered my lost child, and all I lost was that days progress up until the event. You use your last saves!
Find your save files at "Documents > Electronic Arts > Sims 4 > Saves"
You will see a long list of files with names like Slot_000000012.save or Slot_000000012.save.ver1. Each file number has up to six versions, the higher the version number, the older the file (.ver4 is the oldest)
The one with the ".save" file extension is the file that would load if you launched the game and continued from where you left off, this is the one you want to delete. Right-click the save you want to load and choose Rename, Delete the part of the file name after .save. (ver...) Click Enter.
Example: "Slot_000000012.save.ver4" should now be "Slot_000000012.save"
Load your game and keep playing like nothing happened!
Check out this link, it explains how to rearrange/recover older saves.help.ea.com/ca/help/the-sims/the-sims-4/how-to-restore-a-previous-saved-game-in-the-sims-4/ if my explanation did help lol
