I saved a family to my library. I aged up the infant sim to an adult in CAS and when I use this sim in gameplay they glitch. I recieve a notification to say they have hiccups and they drop down into the infant sitting position.
Option 1: Age them back down in CAS then age them up in Live Mode with a birthday cake. Aging them up in CAS preserves their infant quirks, the birthday cake should fix it.
Option 2: Use the cheat "testingcheats true", then shift click on your Sim. There should be a "pack cheats" menu, click Growing Together, and then remove all infant quirks.
The Sims Team
