The single most popular type of cheat people search for in The Sims 4 is something to influence pregnancy - either to produce twins on demand, have a boy or girl, or just become pregnant without woohoo. You can also make it more likely to have baby boys or girls.
The Sims 4 Pregnancy Cheats How to Force Twins or Triplets, Have a Boy or Girl It is possible to force a Sim to have twins or triplets, or immediately go into labor with a cheat.