The total fertility rate in the US is about 2.1, so about 2.1 children born per woman. However I can’t find out if that means ‘most’ families have 2 children or if there are tons of people with 0 children and tons more with 4 children. Its a generic calculation and I don’t know if that means we live in a country where most everyone has 2 kids, or if there are tens of millions of families with 4 kids and other families with 0 kids evening each other out.

So are there statistics broken down by age and number of children instead of a generic total fertility rate? ie, statistics that say at a certain age (20, 40, 50, etc) x% of men or women have 0 children, y% have 1, z% have 2, a% have 3, etc?