November 2020
Any update on this...? I've gotten lots of twins, but still no triplets.
February 2021
If anyone is still encountering this issue, could you possibly share a save file with me where you've seen it occur? You can DM me the link to your save, thanks so much!
Instructions for sending me your save: http://answers.ea.com/t5/The-Sims-4-Bug-Reports/INFORMATION-How-to-Send-User-Files-to-The-Sims-4-Tea...
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March 2021
I have the same issue. Fertile trait but single births only. This isn't random, it's definitely a glitch.
March 2021
March 2021
November 2022
May
With or without the Fertile trait - I honestly cannot remember the last time I had a Sim give birth to twins. It has been ages - it just never happens anymore.
May
I have no mods, and have been using multiple couples in tandem with all available fertility boosts in game and have not gotten a single set of twins, let only triplets. Used fertility trait, fertility massage, "on the leyline" lot trait, and the elixir of fertility. NOTHING.
June