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I put every one of them into different rooms, yet they somehow keep having kids, and it's getting crowded. I don't want my place to be endless z levels of room, help. Why do they keep reproducing?

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Which version are you playing on?

On the live version (, you can edit the max population. There's a button on the top left of the screen that lets you do so.

On the beta version (, you need to middle mouse click the human population (should be on the top middle stat bar) and set a max there. Alternatively, you can disable the bedroom function for the home. That'll keep them from procreating. But, that's on a per-household level and that might be tedious.