I don't really understand the distinction: fewer children per family is the same thing as fewer per person right? Like if you have 1.4 children per person on av

I don't really understand the distinction: fewer children per family is the same thing as fewer per person right? Like if you have 1.4 children per person on average that means exactly 2.8 children per adult man + woman? All I meant to point out is that "birth rate falling" doesn't map to "population falling", if the average number of children per couple drops 2.5 to 2.1 then each generation is still larger (and the population still grows exponentially).