It clear that this opinion be true. Children need not only food for existing but also everything for development.
In the poor countries, children have to work hard to earn a living, no education, no entertainment...A question is why in these countries, a family has so many children while it cannot afford its children to develop. In my opinion, the main reason is the low level of people's cultural standard.
In the poor countries like Vietnam, people have a conception of sexual discrimination. People believe that men are better than women, so couples try to give birth to a baby again and again until they have a male child. Moreover, because of the low level of people's cultural standard, they don't have methods of contraception. After giving birth to a baby, couple have sex, and don't use methods of contraception, and then give birth to a baby, over and over. Their lives become a cycle that children have not enough conditions to develop, and then get married youthfully, and do the same as their parents.
So, what we, the rich countries, the world need to do is help the people in the poor countries develop their conception, their life standard.