Infant/Toddlers needs Declined While playing another lot

New vanilla game. Hired a Nanny before parents left home. Infants needs dropped into the red. He's caring for himself.

I've just had this happen a few days ago.  It's an active career Detective, whose wife is a Freelancer so I could have her home with the twin infants they have.  When he returned, the infants were on the floor beside their cribs with needs in the red and his wife was watching TV.

The next morning I had him hire a nanny, even though his wife would be at home, thinking that might solve the issue.  Nope, when he got home the infants were again on the floor beside their cribs with needs in the red.  The wife was actually standing in their room doing nothing for them, and the nanny wasn't even on the lot.  The nanny did return shortly after the detective got home with the same "glad to see you again" message they give when hired again.

I play on PC and have never used mods or cc.

Sorry if this is duplicate.

Can't travel if I have an infant being left in their house with the parents present. AKA not in daycare. The only needs filling was energy. Hunger, Fun, etc is in the reds. I have everything except Lovestruck.

I just followed by teen to high school with an infant left at home with two adults and her bladder and hunger went into the red while the energy bar slowly filled. Her bladder bar was even past the point where they’ll autonomously use their diaper.

This is still an issue in my game. Sims will not care for toddlers and infants if they are left on the lot, while other sims go out. You have to keep swapping back to the household to take care of them. 

Latest patch. Playing on PC. No mods. No CC. All packs except some kits. 

PC user, single mod but the problem occurs without the mod as well.  If I leave infants or toddlers at home with a teen or adult while on another lot with another Sim, and all individuals are set for "care for self," none of the infants' or toddlers' needs are ever met or taken care of.  I'll come home, and if I've been gone for a few hours, their needs are almost all on red and they are on the verge of being taken away because of it.  There is no option on my teens or adults to "care for children" or something along those lines that would fix this.