The relationship between and family size is very strong all over the world. As literacy levels among girls and mothers increase, the average number of children that they have . This is evident in countries such as Brazil where female literacy levels are as high as . In , the average number of children per family is now below . On the other hand, in where the literacy rates among mothers are in the region of , the average number of children is more than , one of the highest averages in the world.