Sims 4 100 Baby Challenge Rules

How to start the 100 Baby Challenge

The Sims 4 rules are written by Snarky Witch, who credits Amiisays with the Sims 2 original. Her rules page was last updated on February 11, 2025, for Life & Death.

1. Create one young adult, the matriarch. Any look, traits and aspiration, and any gender settings as long as she can get pregnant.
2. Move her into any lot she can afford with her starting funds. She can move again later if she can pay without cheats.
3. Find a donor, have a baby, then find a new donor. Repeat.

The aim is 100 children in as few generations as possible. The run ends when child 100 is born, or when you break a rule.

Base rules

• Lifespan: aging on, set to Normal.
• Donors: one pregnancy per donor. Donors can't move in, look after children or pay anything.
• No marriage while she can still have children. As an elder she may marry, but she moves out to do it.
• No job that leaves the lot. Self-employment and work-from-home careers are fine; part-time jobs are not. Teens may work part time.
• No cheats except bb.moveobjects on for building and fixes for glitches.
• No advantage mods: nothing that enlarges the household or pays child support.
• No picking: don't influence a baby's gender (avoid strawberries, carrots, pop and alternative music while pregnant), and randomize every child's traits.
• No nanny. Maids, gardeners and repair technicians are allowed; caterers and mixologists only at parties.
• No shortcuts: children can't be killed off or left to social services, and young adults who move out can't come back.
• Rewards: aspiration and event rewards are allowed unless they extend life or prevent death.
• Lot traits: keep the ones a lot comes with. On a lot with none, pick three once.
• Succession: when the matriarch becomes an elder, her youngest daughter takes over.

When each child can age up

You may age a child up early once they hit the mark below, which frees a household slot sooner. Letting children age up naturally is always allowed.

Infants must age up with the Happy Infant or Top-Notch Infant trait. An infant who ages up Unhappy fails the challenge.

Pack rules and occult options

• She may run a retail store, restaurant or vet clinic, own rental properties, or live at her business. Teens can staff them.
• Vacations need the whole household along, and not while she is pregnant or has a newborn.
• No vampire or other immortal matriarch. An immortal occult daughter can't take over unless she is made human.
• Life & Death: a matriarch who dies may be reincarnated as a young adult, but only if she finished her bucket list.
• The wishing well can't be used to wish for a child, and a butler can't do child care.

Two optional occult modes, pick one. Occult Incentive: human matriarch, and each occult child counts as two. Occult Themed: occult matriarch with human donors, and only occult children count. Anything the rules don't mention is allowed.

Twins, older rule copies and tips

Twins and triplets are fine. The limit is one pregnancy per donor, not one baby. The 2018 edition of these rules, an older Google Doc, said so directly and encouraged buying the Fertile reward trait. It also offered a 100 Kitten/Puppy variant for Cats & Dogs. That edition predates infants, so follow the current page.

• Line up the next donor before the birth.
• Toddlers are the bottleneck: train every skill to level 3, then age up.
• Push school grades early. An A is the only thing children and teens need in the base game.
• Earn from home with painting, writing or gardening.
• Move young adults out as soon as they age up.

The tracker at the top of this page saves your progress in your browser. The base rules need no packs, like the other base game challenges. For more family marathons see the generational challenges list or the Legacy Challenge.

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