I've seen some people mentioning sex ed, and how these kids could've been so stupid to conceive a baby although they probably had sex ed.
Well, here's my history of sex ed at school:
4th grade (age 9/10): this was more of the time 'there are certain diferences between boys and girls' and sex was only mentioned once at all, and no word about contraceptions of any type
6th grade (11/12): we only had 2 days of class left at that point for the topic, and all our teacher talked about was basically menstuation. There was also a short mentioning about conception, but nothing specific and especially nothing about contraception
9th grade (14/15, which, in this time, is probably too late anyway): that one was only about STDs mainly AIDS ('m not saying this was not important, but, well, there are in fact other dangers to sex as well). For the purpose of STDs we were also introduced to conomds, but our teacher who tried to demonstrate to us how to use them on this model-thingy didn#t even manage to do it properly herself. And there was no handig out of condoms of any time.
So, if those kids had sex ed anything like me, it's sort of a bit more understandle as to why the whole thing happened.