I was initially enthralled with the idea of breeding generations of dwarves, but it's like wading through treacle now the dorfcount is up to 242, 86 of which are babies or children.
They are a plague and they must be culled..
With that many children, it's easy to corral a lot of them together for whatever nefarious purpose you've got.
Build a large room with a retractable bridge for a floor. I like 10X10. Be sure to surround it with constructed walls that can't be reached from outside the room, and put a lockable door in. Designate
all the walls to be deconstructed.
Victims Citizens will rush over to do your bidding. Many of them will be children, particularly if you've got a massive hauling task cued occupying all the adults. If any adults do wander into the room, simply un-designate the wall removal they're working on and they'll leave. Once you have a satisfactory number of children penned in, lock the door and retract the bridge.
With populations like yours I like to gather several loads of children in a holding pen below before I *ahem* dispose of them. Your method of choice is limited only by your imagination and that atrophied excuse for a conscious. Encasing children in obsidian en masse allows you to carve and engrave a terrific and terrifying room/labyrinth/prison for any
pansies parents too week to shoulder the loss of their mewling spawn.