loads of cribs (depending on the amount of children you want/)
A married couple with less than 2 kids
the cooking hobby unlocked
more than on house
first, place all the cribs in a horizontal line with no gaps in between. add a baby. you can change the features. then, go to another house and cook cheese and tomato on toast. click te home button and once the cooking is finished, click on the notification and return to your game. go to the house with a baby and you should see that the infant has moved cots. then repeat the action over and over. (you won't need to play to add another infant to town)