I see people here say that if you have less than X number of square footage, can't have a bedroom for each individual child, etc... that you shouldn't have more children. Here's a little bit of housing history.
"The first North American homes were very small, one room, one-storey structures that were based on European building techniques, and adapted to the building materials, climatic conditions, and topography of the New World. The majority of these structures had less than 450 square feet of space, but were eventually remodelled and enlarged over time. Through the middle years of the 18th century, older houses everywhere were added to and vigorously remodelled, with room heights rising a foot or more. Parlours were added to the homes of well-off farmers and other gentry.
Some large homes did exist in the 1800s. Ranging between 2200 and 2800 square feet, or about the size of a good-sized suburban home today....
It comes as no surprise that houses have grown in size and cost over the years. At the beginning of the last century, the average home was 700 to 1200 square feet. In 1950, the average home was 1000 square feet, growing to an average size of 2000 square feet in 2000. Costs in 1900 were about $5000; $11000 in 1950; and $200,000 last year. An interesting fact revealed in a National Association of Home Builders (NAHB) report is that although homes have grown in size, lot sizes have begun to significantly decrease in size. In 1990, the average lot size was 14,680 square feet. Just eight years later, the average lot size was 12,870. In its profile of a typical new home in 2010, the report suggests that the average lot size will shrink by another 1000 square feet while house size will increase to 2200 or more square feet...."