what make those people do this?!
In poor countries, more people live in subsistence farming and the overall economy is predominantly agrarian. In such conditions, every child in the family is an additional assistant and an extra pair of working hands from childhood. That is, many children here are not a burden, but a family asset.
As the country develops, more people live in cities and a child turns from a family asset into an expensive and long-term project, so in developed countries it is normal to have one, maximum two children in a family.
so Africans have famine even tho they farm?
most of the humanitarian aid go the desert, where they can't farm.
also every single minute 3 Indian farmers commit suicide do to there life conditions, by the time 4320 every day so it's not about the farming,
The point is precisely in agriculture, or more precisely in the agrarian mentality of people living in rapidly growing countries. Even when such people migrate en masse to a more developed country, they take their agrarian mentality with them.