If you can work fluid logic well enough to figure out timers, we might be able to use a living enemy to scare the kids. Just gotta time it so the enemy's only exposed in short, regulated bursts that don't keep the kids from taking care of themselves.
I'm not into dwarven mechanics, but we could just put the enemy behind a window and drawbridge, link the bridge to a lever and expose the child until it's hungry or thirsty and order a dwarf to close the bridge. Needs a lot of micromanagement, though.
See, the game already has a lot of micromanagement without adding childcare to the mix. The construction of a fluid logic timer would add micromanagement while it was underway, but afterwards it would minimize the remaining management to occasionally replacing the monster being used if they escape, and to replacing the subjects when they die or age out. I have no problem with people bulling through it with added micromanagement, I just think if we had a standardized clock to run things for us, it would be even more viable as a regular feature of fortresses.