Not a spell, a limit to the stress generated. https://itch.io/post/1090470
I've posted under it some fixes to the fix that are needed.
Viewing post in Aric's Expansion Rebred
That limits it some, but the next version (which is coming but a series of sicknesses, deaths, job craziness, and breaking the game attempting to build a whole new area has delayed) will address that far better.
Without too much detail, it’ll break down growth into Temporary for pregnant slaves vs Permanent/hyper growth & hyper-lactation for trained cattle. Should provide a happy medium to both sides of the “expanding slaves” and “usable slaves” aisle.
Damn, didn't realize how much you had going on in your life right now (I just figured you were generally busy)... hope you're doing alright, especially given "deaths" being included :|
As far as pregnant slaves' boobs, I hope it'll also be a little less extreme? Most women just gain a few sizes while pregnant IRL. Though (regarding it being temporary) they don't always lose all of them afterward, either - you could make them have a maybe 30% chance of ending the decrease a single size bigger than they were to begin with.