Most people claim that it is better for a female to not become a Mother at a young age, but a brave few say that it is is perfectly fine as long as she is willing to take on the responsibility of raising a child. Sadly, not many of today's teenage girls are ready for that responsibility.
If she became pregnant by accident because of unprotected sex...well, that sucks. This is why there needs to be better sex education in this country, and parents need to have "the talk" with their kids.
If she had it intentionally...well, then this is a girl who has taken her youth and prematurely flushed it down the toilet. This is an example of yet another worthless person, and God knows we don't need more of them in this country.
Girls this young (even if they think they are) are really not ready to have children. The maturity and responsibility is just not there yet. In addition, there is usually a lack of financial resources (money).
For those that may argue that "Well, my grandparents decided to have children at 18, etc..."
Uhm, if you haven't noticed, society is a lot different now. Look around.
"Yeah, it was her idea to get pregnant!"
"Wow. Well, too bad for her. She is a teen mother."