How to make a baby in Fallout Shelter

You do this through the living quarters.
Like the old saying goes, if you put two people in a room together long enough, eventually they’re going to… um. ‘Woohoo,’ to borrow a term from The Sims. Dwellers with higher charisma will speed up the process. My one dweller with max Charisma had some dwellers throw themselves at him within seconds of entering the room. It was amusing. It’s easier from a game mechanics standpoint to just use the same few men and cycle in different women. This all sounds kind of creepy, I realize, but that’s OK.

Here’s where I made some mistakes. After a while, I had no issues with resources at all, and was focused entirely on expanding my population to unlock new rooms. So for a while there, I had more than half of the women in the vault pregnant at all times. When they’re pregnant, it only means that they won’t fight or put out fires, but otherwise they can still work, and they can still train their stats. If you don’t have room for more population, the babies will stay in their mother’s wombs indefinitely. Birth is automatic, and happens when it happens. This is pretty much the only way to grow your vault with any kind of speed. As a side note, if you notice two dwellers in the living quarters not acting all flirty or dancing, zoom in. They’re probably related, and they’ll probably say something about being related. Thankfully, this game keeps track of such things, and you can name each baby to make sure you know their parentage. No creepy, Game of Thrones, Crastor’s Keep stuff in my vault!

This was all fine and dandy until a certain birthing boom raised my population by 13 in the span of half an hour, and then I was struggling like mad to keep everyone happy and healthy, running low on food and clean water. Then, when I built new diners and water treatment rooms, I was running low on power. It was a nightmare.