Okay so it was my child Sim's birthday, I made her mom bake her a cake and everything. Then literally in the split second before she blew out the candles she aged up automatically and became a teen. Then before I had time to cancel the action of blowing out the candles, she did and she aged up again. Now I had a Sim go from child to young adult in one birthday
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Ooh, that's a very sad birthday indeed. Do you want to revert their age back to teen? You can do so by turning testingcheats on then typing cas.fulleditmode and right-clicking the aged sim and click Edit in CAS to set their life stage down.
I had that happen - birthdays drive me crazy, I always end up have to bake a number of cakes cause some idiot sim will take a piece of cake before I get the candles on it
I use MCC so I used it to age her back down to teen.
Just age them down in CAS.