I also suggest you archive the wifes.txt in a new .kfs and put it inside \data\mods folder so you don't over-write the game files. If you're interested I've also made a mod that gives a significant boost in abilities to all babies so people would no longer be unsatisfied regardless of which child they get, thus removing the need for cheats or file editing. I was gonna post it once it's been fully tested but if you want it, drop me a note and you can get it at any time.