Another reason why it is tougher to have a large family is that it is easier to lose children than in a small family. In a small family, you don't need to keep an eye on so many kids. In addition, one grown-up can hold two children's hands, so they won't get lost. Adults have the eyes to see two kids, too. With any more kids, they won't have enough eyes to watch them.
Lastly, in small families parents have a lot less work to do. For example, the parents of a small family get to cook less food, buy less clothes, and do less laundry. This also means that they spend less money on food and clothes.
In conclusion, I think that smaller families a better because smaller families don't need the money for a large home, it's harder for small families to lose their children, and the parents will have less work to do. Do you see why smaller families are better?