Controlling Family Size in The Sims 3: Cheats, Adoption, and Custom Content

Legitimate Ways to Grow a Big Family

1. Multiple Births

• Twins/Triplets: Base chance ~10% twins, ~1% triplets.
• Fertility Treatment Lifetime Reward (40,000 LTH): Dramatically increases multiple-birth odds (~50% twins).
• Fertility Massage (Spa Day) / Procreate interaction (Into the Future): Temporary boosts.

2. Adoption

Use the phone → "Adopt Child". You can adopt multiple children sequentially, even while a Sim is pregnant. Adopted children arrive as toddlers with randomized traits.

3. "Try for Baby" Spam (No Cheats)

With high romance, "Try for Baby" succeeds ~80% of the time. Queue multiple interactions; each pregnancy takes 3 Sim days. Combine with Fertility Treatment for rapid expansion.

Cheats (Use testingcheatsenabled true)

• sims.add_buff pregnancy_inlabor – Instant labor.
• sims.add_buff buff_Pregnancy_Trimester1 – Force pregnancy (repeat for multiples).
• cas.fulleditmode → Shift-click Sim → "Modify in CAS" – Edit traits, age, gender of any Sim, including newborns.
• bucks.unlock_perk PointsForFertility – Free Fertility Treatment.

Custom Content (CC) & Mods

• NRaas MasterController: Advanced household management, pregnancy termination, trait editing, population control.
• NRaas StoryProgression: Configurable town-wide birth rates, household caps.
• Custom traits/objects: ModTheSims, The Sims Resource – search "more children", "family size".

Warning: Large households (>8) via mods can cause routing lag, save bloat, and story progression errors. Test incrementally.