I recently embarked in a new world where all civilizations have fallen, and I mean all of them. There are no Dorfen, Human, Elven or Goblin settlements being occupied after 550 years of history. However, there are still a few dorfs living in what I assume to be unsettled, disparate populations. Most dorfs seem to be abandoned at birth with unknown Parents. Pretty much immediately my settlement assumed the role of Mountainhome, one of my starting 7 became Queen, and luckily she was level headed with very manageable needs (Except for a random panic surrounding a need for clear glass furniture in her throne room when I was just 20 dorfs strong, which I had to figure out how to make Pearlash rapidly.)
So here's the deal, there are still a decent number of dorfs living out in the wilds, somewhere in the neighborhood of 300. They started flocking to my settlement immediately after the first caravan even though I barely traded anything in that first autumn season, but I want to rebuild the Dorfen civilization and create a new generation of dorfs forged in the halls of my fortress. I put the cap on the population to 100 which quickly filled up from migrants, but left the absolute cap to 220. I want to fill in that space with new dorfen children, but It's been 5 years now and I only have 5 kids, 3 of which were migrants, and another 3 migrant children that have since grown up. I put the child cap to 100, and the "percentage" I left at 200. (is that 200%? 20%? I don't get this number.) and nobody seems to be having children. I thought maybe I was overworking dorfs so I enabled a lot of labor redundancy and put a lot of the more intensive processes on longer turnover rates in the manager menu (Restarts monthly to restarts seasonally, etc. Except for a very reasonable 3-of orders that repeat monthly to auto-complete queen/mayor demands.) I now have roughly 5-15 idle dorfs at any given moment, and anywhere between 5-25 dorfs socializing/praying/story-ing.
I don't know anything about modifying the RAWs or anything else, this was all done through the LNP. Is there something in my settings that's preventing new births from happening? Are there in-game conditions that prevent/contribute to the likelihood that a birth takes place? Are there actual 'pregnancy' events where the dorf needs to interact with a spouse or another in order to have children? I tried googling this question, but all I found was a furious cacophony of angry forum goers of their fortresses rampant with babies.
My long term goal here is to get a population near 200 with children, then bump up the fortress size limit to 500 or something crazy for long enough to get the majority of the other lost dworfs to migrate. The reason I'm not bumping up the pop cap immediately is because I don't want 300 migrants to make my game crawl as I'm trying to get dorfs to breed, which I assume would take like 5-20 game years to realize. If I could establish this sort of Beacon of a Mountain home, I'd then set up a few small hillocksy embarks with populations of 30~, until I've re-established the dorfs to a sizable couple thousand. It will be a peaceful land for time immemorial, but tales speak of a great end times that a certain cult will try to accelerate...