Infant bugs

So are my sims the only one affected by the constant infant sitting glitch ex:my sims who are toddlers and older when glitch and sit like an infant for 3 secs (kinda disturbing) 

Another thing is the mood let's glitch they will have mood let's from when they're infants or toddlers and it will constantly make them sad (very annoying)  

Is that just my game if so does anyone have any ideas to help fix it 😭🙏