So this is the second time I've encountered this glitch; the first time I never really knew what caused it.
The situation was the same in both cases. One of my Sims would take all the children to the Park (the first time it was one child, the second time it was four children,) while her wife stayed home with the baby. I'd be in control of the Sims at the Park while the wife left home would be set to "Care for Self."
Once I send my Sim and the children home, the baby's status shows green. The baby never cries again to indicate that she's hungry or uncomfortable, and she never needs her diaper changed (presumably because she's not being fed.) Her status will remain green forever and eventually I'll start getting notifications that she's starving and will be taken away if I don't feed her. This has happened with two different babies. Both of them were female, adopted babies.
Saving the game, exiting to the main menu, and reloading the save seems to fix it. (Thankfully, I noticed as soon as I brought the Sims home from the Park the second time that the baby was remaining green for an abnormal amount of time, and saved my game in another slot in anticipation of her being glitched.)
Sorry if this has been mentioned before, I looked through the list of known bugs and didn't see anything like it.
Edit: Forgot to mention that I am not using any mods, and do not have the "Outdoor Retreat" or "Get to Work" packs, only the base game.
