Normally it is the middle class don't have more children. They are not poor, then kids are more expensive when you can afford things for kids, you want to inves

Normally it is the middle class don't have more children. They are not poor, then kids are more expensive when you can afford things for kids, you want to invest in them, and they are not rich enough to not worry about cost. Kids in poor family will cost only food, and minimal maintenance :)