I am playing on PC with no mods. I think this is a recent bug, because the last time I played with a toddler a few months ago I didn't notice this problem. I have a toddler in my household who has maxed out the potty skill and is able to use the potty on her own. However, after my toddler uses the potty, she needs a diaper change, but it seems to occur only after she has been picked up after using the potty.
So she'll use the potty, immediately after if she clicks on the changing table, or an adult sim does, there won't be an option to change diaper, just to plan/change outfits. But as soon as she's picked up, the option to change diaper will appear on the changing table when clicking with the toddler or the adult.
I would expect that option to no longer appear unless the toddler uses her diaper, especially because diaper changes on the table take so long.
