Yeah I already knew about the baby making command bit it seems a little to... Instant. And the child also has no genetic father when doing this. It also seems to be very unreliable when make a new baby like that, I guess il share a story of my first time using this.
I created a new female adventure, I then proceeded to make her pregnante then after about 3 move sections she gave birth. The child had no name and was just called baby. So I then decided to give it a nickname and such. After that I retired the mother and when to go play as the child. I had only one choice to choose from and it was her. I was then like, oh well guess il make another baby. I then proceeded in doing that. I used a slow and not very effective way to speed up time. 5 years then passed and the new, had a name and all albeat a diff last name due to the last names not actually functioning as last names in df for some reson. The baby was now a child and I was able to take them out to adventure. I then proceeded and the child had abnormally high stats and attributes. I then found his mother, picked her up, and threw he into the wilderness. I had no idea we're she went but she survived it some how. I then proceeded to go around and ripping of cats heads with my feet and went and killed a Minotaur via pinching his toes and then his limbs. I then retired the child and found that the more was still alive when I attempted to make a new adventurer. I chose her and she was in very bad shape. Other decided, hey a couple baby's wont hert when your about to die, 5 children later she died of blood loss. All these children were normal accept 1 the youngest. I sped time up so the eldest was around 18 or so and the youngest was 12. I then set off in the kid due to this chields abnormal attributes. I then after deciding to fight some boogy men was jumped by, a create of the night that oddly had the same name as my adventures mother. I proceeded to fight it. It was a long and gruesome grapple fight but my child ended getting both legs torn off and a lung punctured. I was attempting to crawl away but know my life was going to end then suddenly in front of my person, a baby was sitting all alone in the forest. I was like wtf is that my baby, I then examine and it was just "Lisa" baby. I nicked the first baby that I attempted this with Lisa so I was freaked out. Then my person died. Pretty creepy sing your long lost glitched sister/daughter right before you die and they were still a baby. They should have been 18 years old or around that. Well I just thought I should share my experiences with using df hack but I would want a more authentic experience when it comes to children. I also think there should be away to speed up tame or continue to generate the world after its already made.
That's just my 2 cents.
Btw the speed time little workaround that I found is making a new fortress, embarking then abandoning it. It advances time 1 year each time you do it, the downside though is that it files the legends up with annoying sections of dwarfs running away and dieing in the nearby forests.