Non-Infant Sims have infant moodlets/sit like infants

Hi! I've noticed that some of my sims (usually teens) have infant-specific traits and moodlets. They also sit on the floor how infants do. I've tried aging them down to infants, removing the traits...

live mode

Nepsuli10

Newcomer

2 months ago

So when the baby grows up to an adult, the adult still has traits what it got when it was an baby. for example flatulence or posseting. I always get the flatulence when my sim is a baby and it contintinues to adulthood.

The sim glitches and gets on their knees and the notflication pops up ''flatulence is a trait...´''. It doesn't go away.

Thank you for helping beforehand.