How to Disable the Fertility Treatment Reward in The Sims 3

You cannot toggle off the Fertility Treatment Lifetime Reward once purchased. It permanently increases twin/triplet odds for that Sim (and partners).

Workarounds

• Don't Buy It: 25,000 Lifetime Happiness — just choose another reward (Steel Bladder, Observant, Fast Learner).
• Don't Use "Try for Baby": Use "Woohoo" only — no pregnancy chance without the interaction.
• NRaas MasterController (Mod): Install NRaas MasterController → Sim → Advanced → "Remove Lifetime Reward" → select Fertility Treatment. Requires NRaas Installer first.
• NRaas Retuner: Set `Pregnancy:TwinChance` and `TripletChance` to 0 globally.
• Edit in CAS (Cheats): `testingcheatsenabled true` → Shift-click Sim → "Modify Traits" → remove reward (may not persist).

Why It Exists

Designed for players wanting large families. The base twin chance is 2.5%; triplet 0.1%. Fertility Treatment raises to ~20% twins, ~2% triplets.

Best Practice: If you regret buying it, use MasterController to remove it cleanly. Back up saves first (Documents/Electronic Arts/The Sims 3/Saves).