I saw the general discussion of this from the general discussion 7 months ago, but I want to put it the bug forum. I know I'm not the only player who is experiencing this. I guess I hoped a patch would fix it, but that has not been the case.
In game if you hire a nanny and traverse through the world, the infant's or toddler's needs are so depleted by the time your Sim comes back, it's maddening. They are starving, tired, stinky, and a notification pops up about taking care of your child or protective services will show up. (I have MCCC, so I cheat the needs.) But if I hire a nanny, the game should keep those needs in check, right.
And as I said earlier, this was posted 7 months ago. It has been an ongoing issue.
I don't have any screen shots because my children are older and can take care of themselves. I just wanted my voice to be heard.
Thanks to Redditor, Pinkvoltage, for a screenshot of a nanny leaving an infant after setting the stove on fire.