According to the United Nations, 4,247,694 babies were born in the United States in 2008, the most recent year data are available.
So you would need a pretty substantial net job gain to keep up with population growth
I am not arguing with you at all. In fact, I completely agree. But, I am adding this just for a more comprehensive picture:
In any given month, there will be some people with jobs that die, some people who retire, and then some people who are newly entering the workforce.
So, after you factor all of that in, there still need to be job growth just to stay even because of the net working population growth.