In college, a socioeconomics book brought up that rich people were having less kids and poor people were having many many many kids (like 10), so this wouldn't

In college, a socioeconomics book brought up that rich people were having less kids and poor people were having many many many kids (like 10), so this wouldn't have been healthy when the majority of the families came from those with less resources. I thought I'd get 5 kids or so back then to balance it out.