Global family size
The size of an average family is very different around the world. In countries where most families have one or two children, the population (the number of people in the country) gets smaller. In countries where there are three or more children in most families, the population grows. Where an average family has two children, the population size stays the same.
Populations getting smaller
In the UK the average number of children per family is 1.8. In most European countries, families have only one or two children.
Populations staying the same
In the US, Brazil and New Zealand, the average number of children is about two.
In many countries in Africa, it is common for families to have four, five, six or even seven children.