perhaps - but by then the woman probably has a pretty good job and childbirth would interfere, and, even if she (they) decided to have one, would consider one is enough.
The US legal population is not producing enough to maintain it's percentage and we are dwindling. The others are out- producing us.
Families with father, mother and children are the building blocks of a good society, by design.
How many she decides to have is up to her, but you reinforced my argument, that she would likely be in a more stable position at 25. Recklessly or irresponsibly having children before one is actually ready to do so only causes harm to the children (and often begats a cycle of dysfunction, where children have children and young women become grandparents by their late 20s or early 30s, with most of the children dependent on welfare and absentee fathers, many of whom are in prison).