If you copy the savegame file elsewhere you can carry on playing, then if you don't have the luck to have any kids you can restore the saved game and start over from where you saved it. If need be you can keep doing that until a kid appears. Make sure that you pause the game before backing up the savegame file, though, or you'll find that your peeps have aged and possibly died in the meantime.

Instructions for backing up the files are in the Support FAQ (Windows - change the 'Platform' dropdown if you're using a Mac).