When girls are forced into early marriages, they often are also expected to bear children earlier. That means they typically have multiple children before 25. The problem with that is than their children would most likely also be married off and have many kids of their own. This cycle continues rapidly until the extended family is huge. Now imagine hundreds of this sort of pattern.
Let's say we have 2 people. Person A had 5 children with person B. Now those 5 children have 5 children. That's already 25 people. Now imagine those kids also have 5 children each. That's 125 people in only 3 generations of 1 family. Now take into account the 15 million girls married off every year. If each of them had only 3 children each, and those 3 children had only 3 each, that would already be 135 million more people in the world. The younger the girls get married and the less education they have often means they have more children. This practice of daughters essentially being sold off to whatever man has the most money is not only harming the girls, it's drastically swelling our world population.
Let's say we have 2 people. Person A had 5 children with person B. Now those 5 children have 5 children. That's already 25 people. Now imagine those kids also have 5 children each. That's 125 people in only 3 generations of 1 family. Now take into account the 15 million girls married off every year. If each of them had only 3 children each, and those 3 children had only 3 each, that would already be 135 million more people in the world. The younger the girls get married and the less education they have often means they have more children. This practice of daughters essentially being sold off to whatever man has the most money is not only harming the girls, it's drastically swelling our world population.